V0.11 2014-04-18

• align with handlebars.js 2.0.0-alpha.2
• a275d52 use php array, remove val()
• 8834914 only export used custom helper into render function now
• eb6d82d refine option flag consts
• fc43729 refine comments for phpdoc
• fbf116c fix for tailing ; after helper functions
• f47a2d5 fix for wrong param when new Exception
• 94e71eb add isset() check for input value
• a826b8a support {{else}} in {{#each}} now
• 25dac11 support {{!-- comments --}} now (this handlebars.js extension allow }} to be placed inside a comment)
• e142b6e support {{@root}} or {{@root.foo.bar}} now
• 58c8d84 custom helper can return extra flag to change html encoded behavior now