Set opacity on hint input

iOS Safari will set disabled inputs to opacity: 0.4. In order for the
hint to be fully visible, the opacity needs to be set to 1.
Fix accessing array length in loop condition statement.

Also, add back a missing local variable declaration.
Avoid unnecessary requests by checking most recent url before proceeding
Add and integrate with Transport#cancel.
Use node v0.10 for travis.
Remove required attribute from hint. Closes #806.
Fix #clearPrefetchCache regex namespace bug. Closes #771.
Filter out non-typeahead elements for plugin methods. Fixes #815.
Update query on whitespace change. Fixes #879.
Use jQuery v1.7 for development.
Add undocumented option for bypassing request cache. Closes #848.
Enable support for multiple fields
Run components in strict mode. Closes #675.
Coerce set value into string. Fixes #881.
Change hint input from disabled to readonly. Closes #839.
Add warning to doc about prefetch local storage limits.
Allow customize the style of typeahead highlight text using 'tt-highlight' class.
Fix uglify warnings.
Clean up tt-highlight pull request.
Update CHANGELOG for v0.10.3.