Disable style highlighting, Enable gutter indicators instead (braintr…

…eeps#142)

Current linting settings make it impossible to read certain lines of
code in ruby projects. Specifically the background highlighting for
syntax issues obscures symbols in ruby.

To be more cognizant of readability concerns moving this highlighting to
the gutter should satisfy our need to mark style issues while still
allowing for developers to read the code.

See attached screenshots in PR

vimrc

@@ -140,8 +140,9 @@ vnoremap * :<C-u>call <SID>VSetSearch()<CR>/<CR>
 let g:ale_enabled = 1                     " Enable linting by default
 let g:ale_lint_on_text_changed = 'normal' " Only lint while in normal mode
 let g:ale_lint_on_insert_leave = 1        " Automatically lint when leaving insert mode
-let g:ale_set_signs = 0                   " Disable signs showing in the gutter to reduce interruptive visuals
+let g:ale_set_signs = 1                   " Enable signs showing in the gutter to reduce interruptive visuals
 let g:ale_linters_explicit = 1            " Only run linters that are explicitly listed below
+let g:ale_set_highlights = 0              " Disable highlighting as it interferes with readability and accessibility
 let g:ale_linters = {}
 let g:ale_linters['puppet'] = ['puppetlint']
 if filereadable(expand(".rubocop.yml"))