Removing the need for a build step after changing files

Before the migration to noder-js, it was possible to run Aria Templates directly from its src folder.

With the migration to noder-js, this was not possible any more for two reasons:

1) files in the src folder were using the old syntax (with `$dependencies`) and were converted at build time to the new syntax (with `require`)

-> now, starting with commit b0ae188305c0fa16fe7d458803580da551a1cb94, files in the repository are using the new syntax and it is no longer needed to convert them at build time.

2) the entry point file of Aria Templates needs to be generated (as it is built on top of noder-js, overriding one of its modules) and was generated in the build/target/bootstrap folder.

-> this pull request is changing the location where the entry point file is generated. It is now generated in the src foilder so that it is possible to fully execute Aria Templates directly from its src folder.

The generation of files in the src folder is now part of the full build and can also be run independently with: `grunt src`

The following files are generated in the src folder:
src/aria/bootstrap.js
src/aria/bootstrap-node.js
src/aria/noderError/*.js

After running "grunt src", it is possible to use the src folder directly to serve the Aria Templates files, and then changing most of the framework files can be done without requiring a build step. Running again `grunt src` is needed after changing noder-js itself or files in the src/noder-modules folder.