Handle startup failures (import errors) as errors.
Merge pull request #4 from jone/startup-failures

Handle startup failures (import errors) as errors.
Add missing changelog entry.
Add .gitignore.
Add MANIFEST.in as recommended by zest.relaser.
Preparing release 1.2.3
Back to development: 1.2.4
Merge remote-tracking branch 'wosc/master'

Conflicts:
	CHANGES.txt
	setup.py
Preparing release 1.2.5
Back to development: 1.2.6
Fix import errors problem (TypeError) introduced in 1.2.5.
Preparing release 1.2.6
Back to development: 1.2.7
Exclude system site-packages from tests' sys.path

Recipe allows to exclude system python' site packages from sys.path to
avoid versions mismatches and makes tests more robust and
system-independant.

Basically, this patch unifies recipe.py with corresponding version from
zc.recipe.testrunner.
Merge pull request #5 from kedder/master

Exclude system site-packages from tests' sys.path
Preparing release 1.2.7
Back to development: 1.2.8
Add missing dependency on z3c.recipe.scripts
Merge pull request #6 from ggozad/z3c.scripts

Add missing dependency on z3c.recipe.scripts
Preparing release 1.2.8