Find differences betweeen directories

[petr-muller]

Given paths to two directories representing different codebase states
(like two different revision of the code repository), find Python
content (packages and modules) in the directory and output the
difference between them: packages & modules appearing, disappearing and
changing.

[codecov]

Codecov Report

Merging #18 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #18   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           7      8    +1     
  Lines         849    940   +91     
=====================================
+ Hits          849    940   +91

Impacted Files	Coverage Δ
pyff/packages.py	100% <100%> (ø)	⬆️
pyff/directories.py	100% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3cdba68...cbcf512. Read the comment docs.

[coveralls]

Pull Request Test Coverage Report for Build 137

• 102 of 102 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 125:	0.0%
Covered Lines:	940
Relevant Lines:	940

---

💛 - Coveralls