Fix for python 3 in plugin_pool
Merge pull request #3355 from yakky/feature/fix_py3

Fix for python 3 in plugin_pool
fixes #3348
Merge pull request #3357 from digi604/fix-3348

fixes #3348
increase placeholder slot length to 255 chars.

fixes #3359
slot can now have up to 255 characters
Merge pull request #3362 from czpython/issue-3359

increase placeholder slot length to 255 chars.
Add django 1.7 migration for modified slot length
Fixes #3364

Removed links to crate.io
Merge pull request #3365 from maestrofjp/remove-crate-io-links

Removed links to now defunct crate.io
Merge pull request #3366 from yakky/feature/fix_1_7_migration

Add django 1.7 migration for modified slot length
Alias plugin fix for CMS without multilingual support

CMS without multilingual support doesn't necessary have request.LANGUAGE_CODE - I've replaced it with django.utils.translation.get_language().
Merge branch 'patch-1' of https://github.com/donce/django-cms into patch-1