Changed zipline -> catalyst import paths

* Updated cython build scripts
 * Updated setup.py to to install catalyst package
 * Updated momentum example to use catalyst package
 * catalyst executable now supports loading pipelines from multiple bundles

setup.cfg

@@ -4,7 +4,7 @@ detailed-errors=1
 with-ignore-docstrings=1
 with-timer=1
 timer-top-n=15
-cover-package=zipline
+cover-package=catalyst
 with-doctest=1
 testmatch=(?:^|[\\b_\\.-])[Tt]est(?!ing)
 
@@ -17,7 +17,7 @@ description-file = README.rst
 [versioneer]
 VCS=git
 style=pep440
-versionfile_source=zipline/_version.py
-versionfile_build=zipline/_version.py
+versionfile_source=catalyst/_version.py
+versionfile_build=catalyst/_version.py
 tag_prefix=
-parentdir_prefix= zipline-
+parentdir_prefix= catalyst-