fix #64 ios viewport in consistency
add .active class to tab item when it is active. add onActiveTabChanged event for tabbar
implement #47 Tabbar: add setActiveTab() function
clean up comment
fix navigator maximum stack call in checkiOS7
fix #67 navigator left button click triggered twice
Load Onsen UI files dynamically, and discarded plugin-loader.js
Update contributors.txt
Merge pull request #71 from ataruohto0121/ataru_test

Load Onsen UI files dynamically, and discarded plugin-loader.js
Merge branch 'master' into dev

* master:
  Update contributors.txt
merge from dev to dev_1.1