Merge pull request #17 from cedict/master

Fix missing language strings and enable groupings
Added Russian Translation

Added translation of module into Russian language
add missing grade_items_history upgrade step
use cross-db update of capabilities
CONTRIB-4754 Added upgrade step to account for name change from
"attforblock" to "attendance":
- updated itemmodule field in the grade tables
- updated role_capabilities table to preserve old capabilities
- deleted old data from capabilities and role_capabilities tables
bump version to release to plugins db
Changed deprecated get_context_instance to context_module::instance
Added Russian translation to AMOS
Merge remote-tracking branch 'upstream/master'

Upgrade fork from original.
Add user's remarks to report
Merge pull request #20 from ppv1979/master

Changed deprecated get_context_instance()
Merge pull request #22 from nadavkav/master

Add user's remarks to report - part 2
Add user's remarks to report