Made concealing configurable.

Users can now add options to configure whether or not the conceal
feature isused to shorten urls and hide quotes/underscores for
formatting. To disable all concealing:

        let g:notes_coneal_code = 0
        let g:notes_coneal_italics = 0
        let g:notes_coneal_bold = 0
        let g:notes_coneal_url = 0

 This was added because some plugins don't play nicely with concealing.
 In particular, the indentLines plugin is conflicting with coneal on OSX
 (at least).

Author: Anthony Naddeo

syntax/notes.vim

@@ -57,7 +57,7 @@ highlight def link notesSingleQuoted Special
 highlight def link notesDoubleQuoted String
 
 " Highlight inline code fragments (same as Markdown syntax). {{{2
-if has('conceal')
+if has('conceal') && !exists('g:notes_conceal_code') 
   syntax region notesInlineCode matchgroup=notesInlineCodeMarker start=/`/ end=/`/ concealends
   highlight link notesItalicMarker notesInlineCodeMarker
 else
@@ -67,7 +67,7 @@ syntax cluster notesInline add=notesInlineCode
 highlight def link notesInlineCode Special
 
 " Highlight text emphasized in italic font. {{{2
-if has('conceal')
+if has('conceal') && !exists('g:notes_conceal_italics') 
   syntax region notesItalic matchgroup=notesItalicMarker start=/\<_\k\@=/ end=/_\>\|\n/ contains=@Spell concealends
   highlight link notesItalicMarker notesHiddenMarker
 else
@@ -77,7 +77,7 @@ syntax cluster notesInline add=notesItalic
 highlight notesItalic gui=italic cterm=italic
 
 " Highlight text emphasized in bold font. {{{2
-if has('conceal')
+if has('conceal') && !exists('g:notes_conceal_bold') 
   syntax region notesBold matchgroup=notesBoldMarker start=/\*\k\@=/ end=/\S\@<=\*/ contains=@Spell concealends
   highlight link notesBoldMarker notesHiddenMarker
 else
@@ -97,7 +97,7 @@ highlight def link notesTextURL notesSubtleURL
 execute printf('syntax match notesRealURL @%s@', g:xolox#notes#url_pattern)
 syntax cluster notesInline add=notesRealURL
 highlight def link notesRealURL notesSubtleURL
-if has('conceal')
+if has('conceal') && !exists('g:notes_conceal_url') 
   syntax match notesUrlScheme @\(mailto:\|javascript:\|\w\{3,}://\)@ contained containedin=notesRealURL conceal
   highlight def link notesUrlScheme notesRealURL
 endif