Improve Chinese translations

Make translation smooth

Closes gh-871
Set aria-invalid attribute based on validation

As per http://www.w3.org/TR/wai-aria/states_and_properties#aria-invalid
the validation states should only be added after a user has had a chance
to enter a value
Add ARIA testing

Added new test suite for testing the ARIA-invalid features
Also added a few minor fixes for typos in the QUnit scaffolding and
JSHint errors
Fix "%o has no name assigned [object HTMLInputElement]" errors in bypassValidation tests
resetForm should clear any aria-invalid values
Initial ARIA-Required implementation

Add aria-required tags to any of the data, static or class required elements.
Dynamic validation for rules added through the form.validate rules object do not get picked up till first run.
Add build setup instructions
Add Instructions for getting the dist files

Moved remaining contributing instructions to Contributing guide
Fix require_from_group and skip_or_fill_minimum

Stops the require_from_group and skip_or_fill_minimum validation
methods from clearing previous validation rules on a form.

It does this by creating a cloned copy of the form's validator for
each group of conditionally required fields.  This validator is then
used to validate field group and is stored for re-use (fixes #412).
Add qunit tests for conditional validation rules

Updated tests for require_from_group and skip_or_fill_minimum rules.
The tests now check that other validation rules on the form are
enforced.
Methods: Update email to use HTML5 regex, remove email2 method

The regex provided by the HTML5 spec allows email addresses without a top level
domain, like name@localhost. That makes the email2 method pointless.

Hopefully this is the last time the email methods ever has to be updated. At
least it will make bug triage easier: If you don't like the implementation,
report an issue against the HTML5 spec.

Fixes gh-828
Closes gh-753
Closes gh-739
Methods: Fix tests for email method. Follow-up to dd162ae
Grunt: Add 'start' task that concats and watches
Core: Disable deprecated $.format

Throwing error if $.format is called and updated all deprecated calls to use
$.validator.format.

Fixes gh-755
Closes gh-971
Messages: Update messages_sr.js, fix missing space

Closes gh-948
Messages: Create messages_sr_lat.js

Serbian uses both Cyrilic and Latin alphabets. This is the Latin alphabet
version.

Closes gh-947
Messages: Fix sr_lat translation, add missing space

Closes gh-975
Methods: Localized methods for chilean culture (es-CL)

Provides `date` and `number` implementations as overrides for `es-CL`

Closes gh-929
Messages: Add icelandic localization

Closes gh-902
Messages: Create messages_tj.js

Added Tajik (Asia/Tajikistan) language

Closes gh-888
Core: Fix support for multiple error classes

String#replace with a string argument replaces just once, not all matches.

Closes gh-884