Fixed issue #1689
[VariationBundle] Fix unexpected dependency issue
adjustments on .gitignore
User email as username for OAuth login.
Order comment system.

Provides the ability to notify customers about order changes in the administration interface.
Merge pull request #1886 from stloyd/feature/order_comments

Order comments.
[CoreBundle] Add ability to information how many products were sold
[OrderBundle] Remove unused config parameter
Add "email" to Facebook OAuth scope.
Merge pull request #1890 from stloyd/patch-2

[OrderBundle] Remove unused config parameter
Merge pull request #1887 from stloyd/feature/sold_variants

[CoreBundle] Add ability to information how many products were sold
Merge pull request #1807 from stloyd/bugfix/variation_validator

[VariationBundle] Fix unexpected dependency issue
[Promotion] Make sure that coupons are always unique
[CoreBundle] Fix typo in `state-machine.yml` file
Merge pull request #1896 from stloyd/bugfix/core_sm

[CoreBundle] Fix typo in `state-machine.yml` file
Merge pull request #1895 from stloyd/bugfix/coupon_unique

[Promotion] Make sure that coupons are always unique
Merge pull request #1889 from kayue/patch-1

User email as username for OAuth login.
Merge pull request #1876 from cordoval/could-we-ignore-cache-entirely

adjustments on .gitignore
improve how example reads
Merge pull request #1695 from umpirsky/fix/issue-1689-a

Fixed issue #1689