Check for existence of a defined character set in table creation SQL

Resolves #233
Apply charset fix on rest of the tables
Add charset check to update routine
Removing superfluous parenthesis in statement
Merge pull request #234 from x-team/issue-233

Check for existence of a defined character set in table creation SQL
Trivial code formatting and typo fix
Add timeago js lib, to update relative time entries in Stream list

Fixes #247
Calculate time diff correctly with respect to timezone
Correct usage of title of link-type settings fields
Add support for File field type in Settings API
Fix static method call
Merge branch 'develop' into issue-249
Add form enctype to allow file uploads
Correct file name attribute
Merge pull request #248 from x-team/issue-247

Update relative time entries in Stream list
Merge pull request #250 from x-team/issue-249

Add `File` field type to Settings API
Get keys translations based on option name, not group name
Merge branch 'develop'