Corrected English grammar and wording

Corrected some English grammar and general unusual use of the language. I added a word with an apostrophe. I'm not sure if that should be escaped for XML or not. (It isn't currently). Please change if it should be escaped!
Updated English to more normal use of the language

I had to change the index_description quite a bit, but I chose to try and keep what I believe is the original intent of the text, more than the words that were used
Updated English to more normal use of the language

Line 3 was changed quite a bit to keep the intent of the language, rather than the original words.
Updated English to more normal use of the language

...and fixed a typo (grops / groups). :)
Merge pull request #14 from Bugsbane/master

Improved English grammar, wording and spelling