Update Symfony deps

This should be safe and would allow to not use a new branch for Symfony 2.3.
Remove mrclay/minify custom repository

mrclay/minify is now on packagist, so not needed to define a custom repository.
LessphpFilter: Add setLoadPaths method
Typehint loadPaths, don't use fluent interface
Merge pull request #384 from fabpot/patch-2

Update Symfony deps
Merge pull request #388 from ShonM/master

LessphpFilter: Add setLoadPaths method
Merge pull request #385 from barryvdh/patch-1

Remove mrclay/minify custom repository
Add Ember.js template precompile filter

Adds a filter to precompile Handlebars templates for use in the
Ember.js framework.
Updates travis.yml and docs

Updated the docs for the TypeScript filter and the Ember.js precompile
filter. Updates travis.yml to include ember-precompile npm package in
the CI build.
Fixes return code and environment var

Fixed return code check for those Windows systems that return negative
exit codes. Also renamed HANDLEBARS_BIN to EMBERPRECOMPILE_BIN.
Merge remote-tracking branch 'Blackshawk/master'

Conflicts:
	README.md
With Less 1.4 "Maths is required to be in parenthesis"

see changelog at http://lesscss.org/
Allow user to add option when using the LessFilter
LessFilter: Add setLoadPaths method
ScssFilter: Add setLoadPaths method
LessphpFilterTest can't inherit LessFilterTest because we didn't use the same options
Allow user to add Parser option such as "relativeUrls"
Merge pull request #402 from BenoitLeveque/fix-less-1.4-strict-math

With Less 1.4 "Maths is required to be in parenthesis"
We can't use parserOptions attributes because each assets alter this var
initial framework for asset dependencies