Added outline for section on creating custom frame mojit.
Created draft of section on creating custom frame mojit.
Fixed a formatting issue with the reST.
More fixes to the reST.
Made edits.
add more unit tests for cli mojito test
Linked to the master version of 'HTMLFrameMojit' and added an explanation of the advantages of your frame mojit having a 'child' instance.
Merge pull request #964 from zhouyaoji/docs_create_frame_mojit

[doc] Added a section in the Frame Mojit chapter explaining how to create custom frame mojits.
Merge pull request #962 from lzhan/clitests

add more unit tests for cli mojito test
Added docs for view engine config and partials support.
Made copy edits.
Fixed formatting of a table.
Added note about Mustache and explained that partials have access to the same data as templates.
Added a note about the possible encoding issues with Mustache tags.
Added that you could use {{{}}}} to avoid default encoding by Handlebars.
Merge pull request #967 from zhouyaoji/docs_handlebar_partials

[doc] Added documentation for using Handlebars partials and information about using Mustache templates that are rendered by the Handlebars engine.