Rename README.textile to README.md
Updated README to valid markdown syntax
Updated README 

README declared Google Collections Library as an dependency.
As the dependency was changed to Guava Libraries in the 5.7 release the README has had to be updated.
fix for SF-667 JavadocStyle checkHTML bad Extra HTML tag found errors
fix for SF-667 JavadocStyle checkHTML bad Extra HTML tag found errors, font tag was added
Merge branch 'master' of github.com:checkstyle/checkstyle