added form_data parameter to the pre_save method in developer docs for field types
Merge pull request #120 from heylookltsme/2.2

small change to developing-field-types/methods.md
Merge pull request #119 from ChristianGiupponi/2.2

Added example code in Sitemap
Work in progress docs.
More information on PyroCMS URLs.
Defining some styles for samp and dfn.