Try generating a different kind of hint
Merge branch 'master' into hint

Conflicts:
	conda/resolve.py
Fix some duplication in the NoPackagesFound error message
Test for NoPackagesFound, not just RuntimeError
Fix NoPackagesFound for recursive dependencies
Merge pull request #667 from conda/nopackagesfound

Fix NoPackagesFound for recursive dependencies (fixes #666)
Update CHANGELOG
add test case
Merge branch 'master' into hint
Allow to choose the alternate hint method via a command line flag
change default of --known option (now --unknown)
Merge pull request #671 from asmeurer/hint

An alternate method to generate an unsatisfiable hint
Update CHANGELOG
Merge branch 'master' into install-table
Remove some duplication in the package formatting code