Merge pull request #218 from erikflowers/master

- Cleaned up english translation
Merge pull request #219 from erikflowers/master

Missed one spelling error.
Temporary workaround to remove `not found` message on slow page load
Updated custom icons delete ui & animation centering styles
Rolled back glyph selection init, to keep glyphs codes. Possible collisions resolved on config import.
Icons update
Custom icons UI update: single delete -> edit
Added glyph params editor
Added glyph icons on options dialog
Fix double compression
Merge pull request #224 from fontello/fix-double-compression

Fix double compression
added fontello_rails_converter
Merge pull request #227 from jhilden/patch-1

added fontello_rails_converter
Sync: loader, env, bundler logs
Fixed busy codes/names tracking for custom icons (on session load & import)
Fixed back size slider state save
updated dependencies
Updated FA to 4.0.1, closes #229
Increased input width for glyph charcodes
improved locks - fixes freezes on import config with custom icons