Format dates and times for R analysis
Refactor formatDatesAndTimes()
Add formatAdditionsAndDeletions() and removeNAs

For binary files, git log reports '-' as the lines added and deleted,
so those get coerced to NAs.
Add getCommitsPerDay()
plot commits per day (add plotCommitsPerDay())
Add labels and title for commits-per-day plot
Add RData, RHistory, and .gitignore to .gitignore
Add cumulative commits per day

refs #51
Plot small multiple summary of lines added/deleted by day
Use sha for computing commits per day

 (instead of lines_added)
Add Plots for individual lines added and deleted by day

Also add getFilesThatWereChangedMoreThanOnce()
Add cumulative commits over time
Remove dependency on reshape2

Remove unneeded print statement
Use colorbrewer palettes for small multiples

Rename SummaryOfLinesAddedAndLinesDeletedByDay() to
SmallMultiplesOfAdditionsAndDeletions
Wrap graphics output PDF creation into a function
Merge branch 'master' into r-graphics

Update for file renames and filepath sanitization
Call R Script from Python

Pass the repository path argument to the R script and output a single
PDF file.
Update README to include RepoStatistics info
Add sample graphics to README
Merge pull request #53 from briandk/r-graphics

R graphics