add jstock.sh

[larfalitl]

Hi,

The updated jstock.sh as discussed ages ago.
Using the built-in type command instead of the external which & exiting on error.

Let me know how it goes.

Cheers

[larfalitl]

Hi,
Patched jstock.sh

And added the icons to a directory in lib.

[yccheok]

Sorry. Since I'm not familiar with Linux, may I know what is the advantage of

Using the built-in type command instead of the external which & exiting on error. ?

As I tested using original jstock.sh, it works fine for me so far.