AESH-264
[AESH-260] Not load System.getenv() on forge.
[AESH-265]
added error stream
[AESH-263]
commands can now execute other commands by pushing to the input stream
Merge pull request #89 from danielsoro/AESH-260

[AESH-260] Not load System.getenv() on forge.
Merge pull request #88 from eprogramming/AESH-264

AESH-264
codestyle + cleanups