Improved code and solved #3

Changed code to match [bluMyst](http://www.reddit.com/r/ProgrammerHumor/comments/1w59yt/a_userscript_that_injects_political_correctness/cezw9zf) suggestions and solved #3 issue.
Now all script settings are next to head and is made only from strings, for easy editing.
Regular expressions are created separately, fixing issues with replacements inside words or starting, or ending, text nodes.