[enh][error_messages] add new error messages fix current one
[enh][error_messages] improve error message
[enh][error_messages] add is not an array error message
[enh][interpreter] print variable name

* TODO print out array index and name
[fix][interpreter] fix Memory.openStackFrame call inside Interpreter.run
[enh][interpreter] show line if interpreter error occour
Merge pull request #121 from pointhi/master

[enh][error_messages] add new error messages and add new one