This patch adds Support Map Tests to the rhino test suite. It makes the
following changes:
1. Fix typo in the Gruntfile.js for the sourcemap-test
2. Update Gradle build to always build the less-rhino-<version>.js
before running the tests
3. Add a new testRhinoSourceMap and add it to the test list
4. Add a SourceMapRhinoTest that bootstraps SourceMap tests and then
validates them after they run
5. Add hooks in RhinoTest to support custom bootstraping and validation
6. Add compiled version of source-map (version 0.1.31) because Rhino
can't dynamically pull in dependencies
7. Add source-map to the Rhino build with a Header/Footer that wraps
source-map as a less-friendly dependency
8. Update lib/less/rhino.js to properly handle (some) source-map options
and add a new one (--source-map-output-map-file) that will output the
source-map to a separate file (so we can validate our Rhino tests)
9. Remove unused callback in less-test.js
```INFO: [Minify] Minify: Exception in minifier: input:1665: WARNING - Parse error. Non-JSDoc comment has annotations. Did you mean to start it with '/**'?```
Both lessc and less.js can now be provided with global variables that
all .less files will have immediate access to. This can be used to
provide, for example, a base path for an @import, signed URLs offering
temporary access to an image on S3, or anything else.
lessc has two new parameters, --global-var and --modify-var. Both take
a value of the form "varname=value". --global-var declares variables
immediately before the content of the .less files, and --modify-var
declares them after.
--global-var is used when rules, imports, or other variables will depend
on the provided variable.
--modify-var is used to override a variable declared within the .less
file.
less.js's equivalent for global variables is less.globalVars. This can
be set before loading less.js. There is no new requivalent to
--modify-var, as less.modifyVars can be used for that purpose.
