resource(".xls") -> Excel

adds into(DataFrame, Excel) using pd.read_excel
removing unnecessary psycopg2 imports, using splitlines() instead of split('\n') for py3 support, switching out mysql-python for pymysql (mysql-python does not have py3 support)
Merge branch 'master' into resource_excel

Refactor resource(Excel) for new regex technique
add into(DataFrame, Excel) tests in test_into.py

Conflicts:
	blaze/api/into.py
	blaze/api/resource.py
	blaze/api/tests/test_resource.py
	blaze/data/__init__.py
Removed duplicate into(pd.DataFrame, CSV) so that the currently used (and better) version is the only one defined.
Removed duplicate into(pd.DataFrame, DataDescriptor) so that the currently used version is the only one defined.
Note: I'm not certain that the current into(pd.DataFrame, DataDescriptor) is better than the version that was removed.
The unused version allows an existing dataframe to be populated with select columns from the source.
The currently used version makes a new dataframe and populates it with all data.
Merge branch 'master' into fix/py3_sql_testing
forgot dash in my pip install
changing format options to handle py2.6
Merge pull request #571 from quasiben/feature/binstar_ci

Proper detection of x86_64 and verbose conda build
Test dlpyr transform renames properly
Rename a mapped Series correctly
No schema given but mapping should still be allowed
Test nested transforms
Implement nested transformations
Merge pull request #574 from quasiben/feature/binstar_ci

Finalizing Binstar CI
Add tests for repring more info
Implement pretter repring
Fix server doctest for new repring
StringIO compat
Test a nested partial function
Merge pull request #552 from quasiben/fix/py3_sql_testing

Fixing SQL Testing for proper py3 support