Create otter.spec

Added SPEC file for build RPM packages
Update CHANGELOG
Allow to remove User Agent
Merge pull request #234 from GioMac/patch-2

Create otter.spec
Fix some of issues spotted by Katarn, references #32
Remove dots, as suggested by Katarn, references #32
Update TODO
Checkout translations from Transifex
Expand leading tilde as home directory of user
Percent encode URLs before passing them to QWebHistory, fixes #218