Spelling grammar and whitespace cleanup

Interesting module :)
Attached patch is simply corrects spelling, some whitespace and some grammer.

It also moves to a consistent use of base site (instead of basesite) and sub-site (instead of subsite).
(I'm not sure if this is the right language to use, maybe it should be 'multisite base' and 'sub-site'?)

About to actually start playing with the module. Get in touch if you'd like me to go over the readme and project page text too :)