Adjusted to Bootstrap v3.3.
WordPress Coding Standards optimizations.
Added an interval select filter.
Improved indent.
Simplified the query.
Simplified the to invoice subscriptions template.
Improved the invoice updater.
Only 2 months ahead for yearly subscriptions.
Removed interval from subscription ID column.
Moved the () signs.
Set interval to year if empty.
Adjusted filter to new Bootstrap version.
WordPress Coding Standards optimizations.
WordPress Coding Standards optimizations.
Improved overview of subscriptions to invoice or invoiced subscriptions.
Getting ready for version 1.1.6.
Merge branch 'release/1.1.6'