[AESH-258] Update Aehs build instruction
Merge pull request #85 from danielsoro/master

[AESH-258] Update Aehs build instruction
changed optionvalidatorprovider, no need for it to be so "complex"
[AESH-257]
added OptionActivatorProvider, no hook for it yet
[AESH-257]
added postProcessing of commands/options so we can support optionactivators
being enhanced by the provider
[AESH-257]
added test to verify that optionactivatorprovider works as intended
a simple test to show how to run æsh in a script
a simple explanation
just license added.
[AESH-260] Not load System.getenv() on forge.
Merge pull request #87 from danielsoro/AESH-260

[AESH-260] Not load System.getenv() on forge.
Merge pull request #86 from eprogramming/contrib

just license added.
[AESH-261]
operators should not be parsed inside double or single quotes
[AESH-263]
added pid to ConsoleOperation and CommandInvocation