Spanish: Corrections to chapter 14 (translation style and some spell-checking)
Spanish (5th ed.): small corrections
Spanish: Translation notes (chapter 15)
Spanish 5th ed.: added 15.markmin
English 5th: Various text corrections
Merge pull request #53 from spametki/master

Spanish: corrections for chapter 14
manual merge of https://github.com/mdipierro/web2py-book/pull/52, thanks krmr