Adds support to use objects for options in contentTags, issue: 325
Adds a new selectTag helper that allows us to specify a selected option
Updates the documentation to add the new selectTag helper
Adds missing ticks to indicate the end of the code block
Split templates docs into template and helpers docs.

Document custom helpers in helpers docs.
Update 4-models.md

Corrected the model's properties example, some single quotes were missing
Merge pull request #329 from lgomezma/patch-1

Update 4-models.md
Deletes duplicated files after introducing 6-helpers.md
Passes htmlOptions when using selectTag
Fixes problem on windows when defining the locales key
Fixes issue with the signature of validatesLength in the docs and adds the option parameter to all of the validates* functions
Update 4-models.md

Documented the option in validatesLength to pass just a number as a qualifier to check the exact length of the property.
Merge branch 'v0.7'

Conflicts:
	docs/5-templates.md
nash@gethired.com - Modified lib/sessions/stores/mongodb.js so that a mongodb environment without user/password can be used as a sessions store
Merge pull request #330 from lgomezma/patch-2

Update 4-models.md
Fixes docs to use numbers
Removes model folder that we're not referencing anymore
Merge pull request #331 from MongoSH/master

non-protected mongodb as a sessions store
Removed needless attribution -- it's in the commit itself.
Changes default hostname back to null so it listens to all addresses default