disallow white spaces in hash tags
use 'display' in syntax matching
tiny fix for syntax highlight

- check word boundary
- fix tweetvim_appendix_value highlight
- unified command (do not use :syn and :hi)
- cosmetic change
Merge pull request #40 from rhysd/fix/hash_tag_highlight

disallow white spaces in hash tags
Merge pull request #41 from rhysd/improve/use_display_specifier

use 'display' in syntax matching

Conflicts:
	syntax/tweetvim.vim
Merge pull request #42 from rhysd/patch-1

tiny fix for syntax highlight

Conflicts:
	syntax/tweetvim.vim
improved readm