[NOP] typos, comments
[DOC] extend README, describe algo and tests

fixes #3
[FEATURE] return the number of null and total
[FIX] fix persistence
[FEATURE] add config option to compute posterior
[FEATURE] posterior probabilities for each peakgroup
[FEATURE] Posterior hypothesis for chromatgrams
[FIX] add faster version for chromatogram
[FIX] use fast version
[LOG] improve logging
[DOC] add docu
[TEST] add tests
Merge pull request #5 from hroest/minorStuff

Minor stuff
Merge pull request #6 from hroest/feature/posterior

Feature/posterior
[CLEANUP] pep 8 related changes
Merge branch 'master' of github.com:uweschmitt/pyprophet
[RELEASE] v 0.12.0
[FEATURE] density plot for target - decoy distribution added to report
[FEATURE] density plot for all target - decoy distribution added to report
[FEATURE]: compute d_score & q-value based on all peak groups