Add "local" connector type

[marquiswang]

Fixes #195

Runs analysis tools on the HEAD of the local git repository and reports
to the log.

Allows someone to check for any comments before pushing to
Gerrit/Gitlab.

[codecov-io]

Codecov Report

Merging #206 into master will decrease coverage by 0.4%.
The diff coverage is 58.62%.

@@             Coverage Diff              @@
##             master     #206      +/-   ##
============================================
- Coverage     72.52%   72.11%   -0.41%     
- Complexity      592      601       +9     
============================================
  Files           142      145       +3     
  Lines          1889     1944      +55     
  Branches        121      127       +6     
============================================
+ Hits           1370     1402      +32     
- Misses          462      485      +23     
  Partials         57       57

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/pl/touk/sputnik/review/ReviewFile.java	92.3% <ø> (ø)	7 <0> (ø)	⬇️
...ain/java/pl/touk/sputnik/connector/Connectors.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...a/pl/touk/sputnik/configuration/GeneralOption.java	98.36% <100%> (ø)	3 <0> (ø)	⬇️
.../java/pl/touk/sputnik/connector/ConnectorType.java	66.66% <100%> (+2.38%)	3 <0> (ø)	⬇️
...uk/sputnik/connector/local/LocalFacadeBuilder.java	14.28% <14.28%> (ø)	1 <1> (?)
...ouk/sputnik/connector/local/LocalFacadeOutput.java	16.66% <16.66%> (ø)	1 <1> (?)
...touk/sputnik/connector/ConnectorFacadeFactory.java	57.14% <50%> (-1.2%)	3 <0> (ø)
...a/pl/touk/sputnik/connector/local/LocalFacade.java	71.79% <71.79%> (ø)	7 <7> (?)
... and 1 more

---

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 f4d3393...e1344e1. Read the comment docs.

[SpOOnman]

Thank you for your PR! I have a few suggestions on this, please read them and tell me what you think.

[marquiswang]

@SpOOnman Do you have any objections to #205? That one combined with this makes the maven plugin much more useful for me.

[marquiswang]

I'm actually just realized that this patch doesn't actually work right. I'm using jgit wrong. It does the check on the uncommitted changes (since it does a git diff) whereas I need to do the equivalent of a git show. Will push a fix.

[SpOOnman]

Thank you for your submission! I'm sorry I was unavailable for so long. Great job! 👍