Optimize README
Support NewsContent in ajax/pg mode

1. Add newscontent.html as the content sketch page
2. Add show method to news.py for ajax load content
3. Add exportContent method to news.py for export content page
4. Add content related constants to constants.js
5. Introduce POLYMORHIC_MODE to constants.js
6. Support content_render and newscontent's render in default.init.js
Merge branch 'master' of git.oschina.net:luohao-brian/phonecms

Conflicts:
	static/ajax/constants.js
	static/ajax/default.init.js
	static/ajax/default.init.min.js
Add swipeshow to Gallery in ajax mode
Fix a bug agaist 500 error in admin audio/video edit views
Merge branch 'master' of git.oschina.net:luohao-brian/phonecms
Move PG_* out of config.py

They are deprecated.
Add build script to produce phonegap exports

Usage:

1. To export phonecms to a worksapce:
$ python build.py -v export

2. To clean up the workspace
$ python build.py -v clean
Move slideshow css from phoneswipe example to wap dir
Remove jqm demos
Remove jplayer blue.monday skin
Remove photoswipe examples
Move slideshow css from phoneswipe example to ajax dir
Keep testing jpeg files
Init support for slideshow page in ajax mode
Merge branch 'master' of git.oschina.net:luohao-brian/phonecms
Remove jqm-font assets
Merge branch 'master' of git.oschina.net:luohao-brian/phonecms
Add phonegap export framework
Allow phonegap app across domain