Merge pull request timber#2439 from timber/bugfix/url-helper-param-re…

…turn-value

URLHelper::get_params() return value

Add documentation updates that were posted in the timber/docs repo

Update changelog and version numbers

Merge branch 'master' of github.com:timber/timber

Update changelog and version numbers for 1.18.0

More thanks to give

Update changelog and version numbers

Update changelog and version numbers

Update change log and version numbers to 1.15.1

Update changelog and version numbers to 1.15.0