v1.4.0
v1.5.0
Add CHANGELOG
Fixes and corrections of last pull request.

Correct and simplify code in rate_lines_tested and percentage_lines_tested.
Method gcov_data returns an empty string instead of nil.
Removed checks in nil where the empty string gets processed.
Returning empty array for empty branch_coverage_data_for_statement_on_line values.
Updated spec.
Merge pull request #32 from xing/add_changelog

Add CHANGELOG
Merge branch 'master' of https://github.com/venmo/slather