Updated UG and DG for addTask + addDeadline

* Modified aboutUs page: Ks

* Updated UG and DG for viewDate + selectDate

…into CC

Most of the code in our the code base only puts a single space between
non-whitespace characters,

    "Like " + "this."

It is highly likely that there will not be a case where we will need to
put more than a single space between non-whitespace characters,

    "Like "  + "this."

To enforce consistency throughout the code base, let's add the
SingleSpaceSeparator module to our checkstyle configuration, and fix all
of the existing violations in our code base.

When run in head-full mode, HelpWindowTest fails with the following
exception:

    seedu.address.ui.HelpWindowTest > focus_helpWindowNotFocused_focused FAILED
        java.lang.AssertionError at HelpWindowTest.java:64

The line in question is from the following:

    assertFalse(helpWindow.getRoot().isFocused());

which comes right after:

    // Focus on another stage to remove focus from the helpWindow
    FxToolkit.setupStage(Stage::requestFocus);

However, despite what the comment claims, the call to
FxToolkit.setupStage(...) does not "focus on another stage". This is
because the Stage registered with TestFX is the HelpWindow stage itself.
In other words, we are just requesting the HelpWindow to focus itself,
which is the complete opposite of "removing focus from the helpWindow".

This "focus on another stage" code was written in 1c6071f
(HelpWindowTest: fix failing test in non-headless mode, 2018-04-16). At
that point in time, the stage registered with TestFX _was_ "another
stage"[1] and so the code was correct. However, in a42eded (Fix
stalling HelpWindowTest, 2018-06-26) this was changed such that the
stage registered with TestFX is the HelpWindow stage itself. Yet, the
code was not modified to properly operate in the new world order[2].

Fix this piece of code by creating a temporary stage to focus on, so
that the goal of "removing focus from the helpWindow" is properly
achieved.

[1]: Somewhat-ish. The full story can be found in a42eded (Fix stalling
     HelpWindowTest, 2018-06-26).

[2]: And obviously, the author did not run tests in head-full mode :-S

Modified comments to avoid checkstyle errors

* Modified aboutUs page: Ks

* Updated UG and DG for viewDate + selectDate

Edited the developer guide

corrected developer guide

Added user stories

Minor changes to docs

… 1 user story

…and Summary

* Updated UG and DG for addTask + addDeadline

* Added new feature: defer deadline

# Conflicts:
#	docs/DeveloperGuide.adoc
#	docs/UserGuide.adoc

…into Ks

Added mockup UI + a formatting mistake in DG (#6)

* Minor adjustments to DG

* Replaced AB Ui with TB mockup Ui

edit pics

# Conflicts:
#	docs/DeveloperGuide.adoc
#	docs/UserGuide.adoc
#	src/main/java/seedu/address/logic/LogicManager.java
#	src/main/java/seedu/address/ui/CommandBox.java

# Conflicts:
#	docs/DeveloperGuide.adoc

…lding

Done AddTask + PriorityLevel with lots of refactoring

…into milestone_feature

# Conflicts:
#	docs/DeveloperGuide.adoc

…into newMaster

…into milestoneV1.2(Ks)

…into Midv1.2

# Conflicts:
#	docs/DeveloperGuide.adoc

…ut do nothing

…ing)

…kParser

 into tasks

Added outline of how AddMilestoneCommand will work

AddTask, CompleteTask are complete,Tests modified

AddTask, CompleteTask, DeleteTask completed. More tests have to be refactored.

Updated DG Use case and User Story to include add_milestone feature

Fixed checkstyles issues & removed checkstyleTest from travis check

Added Deadline Class + SelectDeadline

Added Milestone class and AddMilestoneCommand feature

…into MileStoneV1.2

# Conflicts:
#	src/main/java/seedu/address/logic/LogicManager.java
#	src/main/java/seedu/address/logic/parser/CliSyntax.java
#	src/main/java/seedu/address/logic/parser/TaskBookParser.java
#	src/test/java/seedu/address/logic/parser/TaskBookParserTest.java

… AddMilestone

With the unrefactored folders + Modified changes for SelectDeadline &…

Resolving EOF bug [Travis]

…nent of DeferDeadlineCommand