Temperature dependent electrode conductivity

[brosaplanella]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #1506

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #1570 (208294b) into develop (7d413ed) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1570   +/-   ##
========================================
  Coverage    97.78%   97.78%           
========================================
  Files          323      323           
  Lines        17523    17552   +29     
========================================
+ Hits         17135    17164   +29     
  Misses         388      388           

Impacted Files	Coverage Δ
...ction/through_cell/base_through_cell_convection.py	100.00% <ø> (ø)
...ubmodels/external_circuit/base_external_circuit.py	100.00% <ø> (ø)
...ternal_circuit/current_control_external_circuit.py	100.00% <ø> (ø)
...ernal_circuit/function_control_external_circuit.py	98.07% <ø> (ø)
...dels/submodels/interface/kinetics/butler_volmer.py	100.00% <ø> (ø)
...ybamm/models/submodels/interface/kinetics/tafel.py	100.00% <ø> (ø)
...amm/models/submodels/particle_cracking/__init__.py	100.00% <ø> (ø)
pybamm/models/submodels/thermal/base_thermal.py	100.00% <ø> (ø)
...models/full_battery_models/lead_acid/basic_full.py	100.00% <100.00%> (ø)
...odels/full_battery_models/lithium_ion/basic_dfn.py	100.00% <100.00%> (ø)
... and 10 more

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