[#65] First try for coveralls.io support
[#65] nosetest ignores source option
[#65] Omit numpy and pyhrf tests
[#65] Correct coveralls bagde url
[#65] Omit some modules
[#65] Correctly omit pyhrf tests
[#65] Omit distutil module
Merge pull request #74 from thperret/coveralls-support

Coveralls support