v0.5.0

• Readme updates (removed polls sections, v0.5.0 specific changes)
• Misc code formatting fixes (tabs to spaces, modeline additions, reorganization)
• Update API: make WebDevIconsGetFileFormatSymbol return only fenc (fixes #73)
• Added Perl support (enhancement #60)
• Added support for some (mostly frontend) frameworks (enhancement #61)
• Added basic support for vim-flagship (enhancement #70)
• Added support for Unite and Vimfiler (enhancement #54)
• Added support for CtrlP (enhancement #56)
• Rebranding part 1: title and image (vim-devicons) (enhancement #76)