Rascal interfaces to Html, D3, and Dimple. An application is the 
routine barChart.
New directory markup. BarChart has named parameters
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Appended to ValueIO.rsc and Prelude.java the function
   int getFileLength(loc l)  // Returns file size in bytes
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Fixed #419

The code assumed the directories where always first in a Jar file
Fixed 423 crawl library now works correctly with jars
Solution for issue #414. Partial solution for #401

The backtracking for the or operator is now solved as follows:
- a muOr operator added to muRascal.
- a JMPINDEXED instruction added to RVM.

The code generated for || maintains the current alternative and jumps to
it on backtracking. && and || now completely implement short circuit
semantics. The remaining operators (see #401) still need to be adapted.

Note: SendMoreMoney now loops. Not yet analyzed and disabled as test
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Added function barChart. This produces JavaScript which defines a
barchart. The function barChart returns the location of the file, in
which the barchart is defined. It can be shown by htmlDisplay. 
See for working example: 
analysis::statistics::examples::M3BarChart
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Added more tests: backtracking in Boolean expressions still needs work
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Merge branches 'keyword-parameters' and 'master' of https://github.com/cwi-swat/rascal into keyword-parameters