py3 compatibility fix

Fixes https://github.com/paypal/rest-api-sdk-python/issues/53.
fix print statement
Fix except block indentation and import exception

Fixes https://github.com/paypal/rest-api-sdk-python/issues/51 and https://github.com/paypal/rest-api-sdk-python/issues/52.
Add get access token that wraps get token hash
Merge branch 'patch-1' of github.com:dessant/rest-api-sdk-python into dessant-patch-1

Pull in python 5 compatibility fix
Merge branch 'dessant-patch-1' into get_token

Merge dessants patch for py3 fix, closes #54
Merge branch 'patch-2' of github.com:dessant/rest-api-sdk-python into dessant-patch-2

Merge dessants changes to fix block indentation and import exception
Merge branch 'dessant-patch-2' into get_token

Block indendation and import exception
Merge branch 'get_token'

get_access_token method added, patches merged for py3 compatibility and import issues