Scrypt doc + minor fixes on password
Minor fix on key derivation doc
Placeholder doc files for Zend/File
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Merge branch 'feature/en/zend.file' of git://github.com/cgmartin/zf2-documentation into hotfix/382
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Merge branch 'feature/scrypt' of git://github.com/ezimuel/zf2-documentation into feature/scrypt
[#387] Added footnote

- Citing Colin Percival presentation on scrypt
[#387] incorporate feedback

- Incorporated all feedback from @Freeaqingme
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