Update check_installable

* typo (metatdata)
* the 'installable' key could be missing
Fix nightly URL path using version
Don't run flake8 on unported folder
Adding addons_path when creating database

in order to avoid ` invalid module names` error when running test with OCA dependencies
Add dependency related documentation to README.md
Merge pull request #2 from nbessi/master

Fix nightly URL path
Merge pull request #6 from nbessi/nbi-addons_path_missing_on_create

Nbi addons path missing on create
Merge pull request #7 from nbessi/nbi_extend_doc

Add dependency related documentation to README.md
Merge pull request #3 from nbessi/ingore_unported

Don't run flake8 on __unported__ folder
handle missing 'installable' key in metadata
fix usage of env section (closes #11)

updated README.md and sample config file.
add sample coverall.io configuration (closes #9)
merge install and before_install (closes #12)
update README.md with coveralls config
transfer to OCA (closes #10)
install QUnitSuite globally
disable tests when installing base
Merge remote-tracking branch 'core/master'