Align skip conditions and messages and give reasons.
Update changes.
Merge origin/master
Merge pull request #171 from jacoco/issue-171

Align skip conditions and messages and give reasons
Remove unnecessary null check.
Replace our FrameTracker with existing ASM API AnalyzerAdapter.
Happy New Year 2014!
Test case with empty ZIP entry (reproducer for #179).
Broken documentation link (jacoco/eclemma#72).
Fixed typo.
Fix #180 - directory ".idea" should be ignored during check on presence of license-header
Categorize changes.
Explain the reasons and implications of #169 and #171.
Provide core APIs to detect classes with non-matching ids.
Log warning in Ant report task if execution data does not match.
Log warning in Maven report goal if execution data does not match.
Adjust change log.
Merge pull request #185 from jacoco/issue-185

Print warning if class ids differ