V0.8 2014-02-10

• align with handlebars.js 1.0.12
• aaec049 fix partial in partial not works bug
• 52706cc fix for {{#var}} and {{^var}} , now when var === 0 means true
• 4f7f816 support {{@key}} and {{@index}} in {{#each var}}
• 63aef2a prevent array_diff_key() PHP warning when {{#each}} on none array value
• 10f3d73 add more is_array() check when {{#each}} and {{#var}}
• 367247b fix {{#if}} and {{#unless}} when value is an empty array
• c76c0bb returns null if var is not exist in a template [contributed by dtelyukh@github.com]
• d18bb6d add FLAG_ECHO support
• aec2b2b fix {{#if}} and {{#unless}} when value is an empty string
• 8924604 fix variable output when false in an array
• e82c324 fix for ifv and ifvar logic difference
• 1e38e47 better logic on var name checking. now support {{0}} in the loop, but it is not handlebars.js standard