Update linproc.py

minor braces fix
Merge pull request #57 from mathuranand/master

Update linproc.py
Changed linproc.py to arma.py, LinearProcess to ARMA
changed test_linproc to test_arma
Small improvements to arma.py
updated version in setup.py to 0.1.5
minor edit
CAREER: Changed all occurences of bellman to bellman_operator for unifiedsyntax.
Merge pull request #60 from jstac/bellmanoperator

CAREER: Changed all occurences of bellman to bellman_operator for unifie...
Adding Version Attribute to QuantEcon class
Merge pull request #63 from jstac/version

Adding Version Attribute to QuantEcon class
Merged changes from upstream into master.