Contribution: Offset quickfixes

[Petr Hejl]

Hi,
I noticed some issues with offset while using the current Nashorn with 
NetBeans. The patch contains _quickfixes_ for:
- wrong block offsets
- wrong literal finish offset
- wrong case node block finish offset
- block containing var node ending with semicolon finish

I'm not really sure the solution is the best one. Leaving up to you for
evaluation.

Thanks,
P.