Added doc for new form csrf method

Signed-off-by: Derek Myers <arcticpro@gmail.com>
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Merge pull request #568 from sagikazarmark/1.7/develop

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Change CSRF in security docs to use new form csrf method

Signed-off-by: Derek Myers <arcticpro@gmail.com>
corrected the required PHP version
updated instructions for installing FuelPHP inside a docroot

and/or alongside other applications
added options to redirect or hide foldernames with installing in the docroot
fixed namespace typo, added some clarification to using namespaced controllers
fixed example code in Model_Crud introduction
Clarified the use of the "new_name" Upload config key
Merge pull request #570 from indigofeather/1.7/develop

fixed example code in Model_Crud introduction
updated asset docs to include the new inline feature
fixed typo in observer docs
explained the use of DB::expr() when using literals in a join
Updates develop branch version number.
is_frozen() doesn't exists, corrected to frozen()
Merge pull request #571 from Art4/1.7/develop

is_frozen() doesn't exists, corrected to frozen()
documented Input::patch()
second parameter of Config::save() is not optional
clarified the difference between PUT and PATCH;added a note that all HTTP methods are supported