Instrumental

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Features
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- The pragma: no cond system. See the documentation for more information
- We now instrumenta and report on comparisons (unless told not to)
- We now ignore cases unreachable because of literals (unless told not to)
- The inspection and instrumentation phases are no separated. Now non-imported
modules are represented as missed coverage.

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Bug Fixes
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- pragma: no cover now works again for statement coverage

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Bug Fixes
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- The IfExp node (a if bool else b) is now instrumented and coverage is reported.

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Features
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- Statement coverage: Added the ability to gather and report on statement coverage.
- HTML output: Added an option to produce an html coverage report detailing statement
and decision/condition coverage.
- XML output: Added an option to produce a Cobertura-compatible XML coverage report that
can be used by Jenkins to track coverage metrics.
- Test coverage: Added a bunch of new tests around instrumentation. Not enough, but some

Bug Fixes
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- Package coverage reporting: fixed package coverage reporting when running nosetests;
we now instrument __init__.py files.