Added new features to buildbot.

Added new features to buildbot.

Cloc is invoked now to calculate comment ration in daily regression
test. Additionally cloc csv output is printed (can be pasted in report
xls). Aspell check now presents only words in comments and strings
(thanks to pygerrit). Additionally in daily regression test ignored
words csv list is printed (can be pasted to report xls). To be able to
add ignored word type (abbreviation, own name, define etc)
aspell.ignore.txt was renamed to aspell.ignore.json and ignored word
list is defined as json object in format:
[{"word":"ignoredWord","type":"ignoredWordType"}, {...}, ...]

Change-Id: I5013e23fe1cb397cb044089850a48d8ce1ab72de