Added charts and development mode

[alecello]

Graphs

Generic charts

• One pie chart for all contributions in the past year divided by repository
• One pie chart for the total SLOC count divided by repository
• One bar chart for contributions to all repositories in the past year divided by contributor
• One bar chart for contributions to all repositories in total time divided by contributor

  Per-repository charts

• One pie chart with the total lines of code divided by SLOC, comments and blanks (only if using cloc)
• One bar graph with contributions in the past year divided by contributor
• One bar graph with contributions in total time divided by contributor

  Note: per-repository bar graphs are generated only if there are at least two contributors

This should close #3

Developer mode

Added one file config.py and two options:

• devmode: Enables local caching of API requests
• keep_repos: Enable long-term caching of cloned repositories I tested this feature and it's entirely possible to work with no internet connection if both options are enabled. Should close #8

[e-caste]

The result is good. I consider #8 closed, but before closing #3, here are some suggestions:

matplotlib allows to add multiple graphs to the same plot. This could be useful for

• having an aggregation of the 3 repository-specific graphs into one single .svg file, instead of a directory of 3 .svg files
• having an aggregation of the 4 organisation-wide stats into a single .svg file, in addition to (not instead of) the separate files (they may be useful to show some data)

The pie charts without a number of what they represent don't carry much information. Could you add it?

A couple of example graphs should be added to the README imo to show how cool and good we are asd

[alecello]

Commit af9cefa should also close #12

[e-caste]

One last thing: the aggregate graphs for the organisation should be in a separate directory inside the output, so that they're immediately recognisable (e.g. WEEE-Open is a directory, peracotta.svg is an image file)