Added a virtual package 'bottle.ext' that redirects imports to 'bottle_%s'.
Added a virtual package 'bottle.ext' that redirects imports to 'bottle_%s'.

Example::
    import bottle.ext.sqlite # actually imports bottle_sqlite

This gives us nice import statements and a common namespace for all plugins
and might become an official plugin naming convention. It's not just a cool
hack, but a real alternative to setuptools "namespace packages":

 + No setuptools dependency.
 + No overlapping __init__.py files.
 + Support for single-files (module) extensions.
 + Python standard since 2.3 (PEP 302).

prologic/bottle,kevintaw/bottle,ListFranz/bottle,taisa007/bottle-ja,adampresley/bottle,CentricWebEstate/bottle,enzzc/bottle,enzzc/bottle,ifduyue/bottle,hkmshb/bottle,xsank/bottle,catroot/bottle,mrdon/bottle,catroot/bottle,defnull/bottle,bottlepy/bottle,StdioA/bottle,Kjuly/bottle,SamuelMarks/bottle,prologic/bottle,bottlepy/bottle,fkazimierczak/bottle,CentricWebEstate/bottle,kevinmel2000/bottle,hayate/bottle,ericfrederich/bottle,SmithSamuelM/bottle,myzhan/bottle,adampresley/bottle,Kjuly/bottle,hkmshb/bottle,SamuelMarks/bottle,AWFU/bottle,samstav/bottle,gaotongfei/bottle,wangjun/bottle,oz123/bottle,taisa007/bottle-ja,ListFranz/bottle,defnull/bottle,ericfrederich/bottle,wangjun/bottle,fkazimierczak/bottle,khirayama/bottle,SmithSamuelM/bottle,StdioA/bottle,ifduyue/bottle,mrdon/bottle,hayate/bottle,khirayama/bottle,gaotongfei/bottle,kevinmel2000/bottle,Inndy/bottle,myzhan/bottle,AWFU/bottle,oz123/bottle,mefyl/bottle,mefyl/bottle,samstav/bottle,Inndy/bottle,kevintaw/bottle