Use excludeFilter when generating template files

This ignores editor backup files and the like. Intended
to fix #1884.

Added a hidden file to one of the scripted tests, so this
test now fails without using excludeFilters.
[#848] Remove clean-all
update default scala version to 2.10.3
Support multiple message keys in FormError
refactored dependency keys to use component method

added json dependency key
Adapt documentation project to API change of ScalaTemplates class

I wanted to solve this by adding a default parameter to ScalaTemplates
but since ScalaTemplates is a val and not a def, it doesn't seem possible.
Fix so that scala-library with alternate naming can be found
Parse session.maxAge as a duration
Cleaned up/simplified DB code
Removed bonecp releaseHelperThreads config

Fixes #1919

* releaseHelperThreads has been deprecated
* we were disabling it anyway
* 0.8.0 now warns if you set it
Missing 'as'
Improve grammar
Improve grammar
Added generated.keystore to git ignores
Merge pull request #1919 from jroper/1919-bonecp-config

play-2.2.1-RC1 - BoneCPConfig - releaseHelperThreads has been deprecated
Merge pull request #1883 from baloo/improvements/848-clean-all

[#848] Remove clean-all
Merge pull request #1902 from yanns/scala-2-10-3

update default scala version to 2.10.3
Merge pull request #1657 from rfranco/feature/sbt-keys-component

Refactored Dependencies Keys and Added Json Dependecy Key
Merge pull request #1892 from havocp/wip/havocp-exclude-filter-2

Use excludeFilter when generating template files
Fix #1802: Update filter docs for new Action API