fixed issue 270: empty compilation db that is generated with project without .pch files
unit tests are updated for issue 270
[analyzer] Extract the type and category of bug reports as well from the analyzer plist files
Merge pull request #293 from matbd/add_analyzer_component

[analyzer] Also extract the type and category of bug reports
Don’t override PATH when calling xcodebuild
Merge pull request #291 from jlukas/dont-override-path

Update PATH instead of overriding it
Merge pull request #282 from PavelKatunin/master

fixed issue 270: empty compilation db that is generated with project wit...
fix issue where otest-query will accidentally start running tests.

See comment inside for more info.  The gist of it is... a lingering
value stored in the 'SenTest' or 'XCTest' preference can make
otest-query accidentally _run_ tests when all it wanted to do was
_query_ the list of tests.
Log error when running xcodebuild -showBuildSettings.
Merge pull request #299 from dblock/warn-on-build-settings

Log error when running xcodebuild -showBuildSettings.
Merge pull request #298 from facebook/fpotter/otest-query-fix

fix issue where otest-query will accidentally start running tests.