Add missing __all__ to libcloud.storage.base module.
Add missing __all__ to libcloud.storage.base module.

wuyuewen/libcloud,curoverse/libcloud,illfelder/libcloud,wrigri/libcloud,mbrukman/libcloud,wuyuewen/libcloud,munkiat/libcloud,watermelo/libcloud,andrewsomething/libcloud,ClusterHQ/libcloud,Verizon/libcloud,Cloud-Elasticity-Services/as-libcloud,samuelchong/libcloud,sfriesel/libcloud,samuelchong/libcloud,cryptickp/libcloud,mathspace/libcloud,ByteInternet/libcloud,watermelo/libcloud,mistio/libcloud,Scalr/libcloud,atsaki/libcloud,curoverse/libcloud,mistio/libcloud,supertom/libcloud,mgogoulos/libcloud,briancurtin/libcloud,techhat/libcloud,illfelder/libcloud,sgammon/libcloud,ZuluPro/libcloud,cloudControl/libcloud,aviweit/libcloud,andrewsomething/libcloud,ByteInternet/libcloud,Kami/libcloud,Itxaka/libcloud,SecurityCompass/libcloud,carletes/libcloud,aviweit/libcloud,munkiat/libcloud,munkiat/libcloud,atsaki/libcloud,iPlantCollaborativeOpenSource/libcloud,DimensionDataCBUSydney/libcloud,SecurityCompass/libcloud,niteoweb/libcloud,mathspace/libcloud,sergiorua/libcloud,lochiiconnectivity/libcloud,DimensionDataCBUSydney/libcloud,niteoweb/libcloud,marcinzaremba/libcloud,techhat/libcloud,smaffulli/libcloud,sergiorua/libcloud,SecurityCompass/libcloud,iPlantCollaborativeOpenSource/libcloud,erjohnso/libcloud,sfriesel/libcloud,cloudControl/libcloud,iPlantCollaborativeOpenSource/libcloud,Cloud-Elasticity-Services/as-libcloud,sgammon/libcloud,briancurtin/libcloud,jimbobhickville/libcloud,atsaki/libcloud,apache/libcloud,aviweit/libcloud,vongazman/libcloud,mbrukman/libcloud,aleGpereira/libcloud,carletes/libcloud,mgogoulos/libcloud,MrBasset/libcloud,pantheon-systems/libcloud,StackPointCloud/libcloud,StackPointCloud/libcloud,sahildua2305/libcloud,cloudControl/libcloud,smaffulli/libcloud,jimbobhickville/libcloud,mathspace/libcloud,wido/libcloud,thesquelched/libcloud,t-tran/libcloud,jerryblakley/libcloud,MrBasset/libcloud,t-tran/libcloud,supertom/libcloud,wuyuewen/libcloud,thesquelched/libcloud,schaubl/libcloud,apache/libcloud,wrigri/libcloud,erjohnso/libcloud,schaubl/libcloud,apache/libcloud,andrewsomething/libcloud,wido/libcloud,kater169/libcloud,mtekel/libcloud,sergiorua/libcloud,marcinzaremba/libcloud,jerryblakley/libcloud,marcinzaremba/libcloud,Itxaka/libcloud,mtekel/libcloud,watermelo/libcloud,Kami/libcloud,kater169/libcloud,DimensionDataCBUSydney/libcloud,aleGpereira/libcloud,sahildua2305/libcloud,NexusIS/libcloud,niteoweb/libcloud,cryptickp/libcloud,ZuluPro/libcloud,dcorbacho/libcloud,mbrukman/libcloud,wido/libcloud,lochiiconnectivity/libcloud,Verizon/libcloud,ClusterHQ/libcloud,techhat/libcloud,JamesGuthrie/libcloud,pantheon-systems/libcloud,sahildua2305/libcloud,briancurtin/libcloud,sfriesel/libcloud,dcorbacho/libcloud,schaubl/libcloud,pquentin/libcloud,carletes/libcloud,supertom/libcloud,t-tran/libcloud,thesquelched/libcloud,illfelder/libcloud,JamesGuthrie/libcloud,lochiiconnectivity/libcloud,pquentin/libcloud,dcorbacho/libcloud,ZuluPro/libcloud,curoverse/libcloud,Cloud-Elasticity-Services/as-libcloud,JamesGuthrie/libcloud,erjohnso/libcloud,pantheon-systems/libcloud,kater169/libcloud,jerryblakley/libcloud,NexusIS/libcloud,Scalr/libcloud,MrBasset/libcloud,pquentin/libcloud,StackPointCloud/libcloud,vongazman/libcloud,ByteInternet/libcloud,mtekel/libcloud,jimbobhickville/libcloud,mgogoulos/libcloud,Itxaka/libcloud,samuelchong/libcloud,Verizon/libcloud,NexusIS/libcloud,Kami/libcloud,aleGpereira/libcloud,vongazman/libcloud,Scalr/libcloud,cryptickp/libcloud,wrigri/libcloud,mistio/libcloud,smaffulli/libcloud