Merge branch 'release/1.5beta1' into develop
Remove a duplicated line
Set font style via binding
Fix syntax name validation (fix #110)
Add several of new syntax styles
Fill version history for v1.5 (ref #94)
Fix YAML definition
Update Perl syntax definition
Rename reST to reStructuredText
Adjust syntax popup button width
Now view opacity need not multiple of 5%

5%の倍数縛りを辞める
Better YAML coloring
Append `_` and numbers to non-regex chars on syntax coloring (close #8)
Make text size in script error panel larger
Use find indicator for matching brace highlight

Xcode とかのハイライトとスタイルを揃えた。
Improve smart indent (close #114)

`{}` の中を展開するように
Implement text search on script error panel
Create hidden setting for smart indent (ref #114)
Clean code
Fix short cut key to open preferences (fix #115)