imp module is deprecated in v3 so in place of it using importlib - #96

There are two issues in the existing code.

1. imp module has been deprecated since python v3.4
2. Behavior of imp module has changed between 2.7 and 3.5

Here is the issue as mentioned in (2) above with imp module in v3.5.
There is package named "foo" and it contains a module "common". When common module is compiled into .pyc file then finding followed by loading using imp module does not work. The same works with importlib module. Here is the output of both the scenarios.

f, p, d = imp.find_module("foo")
print (f, p)
None /usr/local/lib/python3.5/dist-packages/foo
print (f, p, d)
None /usr/local/lib/python3.5/dist-packages/foo ('', '', 5)
imp.load_module("common", f, p , d)
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/python3.5/imp.py", line 244, in load_module
return load_package(name, filename)
File "/usr/lib/python3.5/imp.py", line 210, in load_package
raise ValueError('{!r} is not a package'.format(path))
ValueError: '/usr/local/lib/python3.5/dist-packages/foo/init.py/init.pyc' is not a package

import importlib
importlib.load_module("foo.common");
Traceback (most recent call last):
File "", line 1, in
AttributeError: module 'importlib' has no attribute 'load_module'
importlib.import_module("foo.common");
<module 'foo.common' from '/usr/local/lib/python3.5/dist-packages/foo/common.pyc'>

The changes here is to just use the new module importlib and not use imp.
These changes are tested with version 3.5.