Pyitect

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Bugfix:
- bug fix with issubcomponent
- System.load will not actually consider subcomponent
New:
- expose load_component in the System class
- use key function to chouse component ins System.load

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- Large API incompatible update
- supports Python 2.6+
- now uses `pyitect.imports` for import time plugin loading
- version postfixes are replaced with component subtypes
- Uses SemVer processing via `python-semanticversion <https://github.com/rbarrois/python-semanticversion>`_ project
- module overlap is prevented with unique model names in `sys.modules`
- no import modes, uses `imp` module for everything >= 3.3 and `importlib` for 3.4+
- ability to store global system instance in `pyitect` module
- support YAML for plugin configuration files
- Custom Exception classes with exception chain support
- fully fledge docs

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- readme cleanup
- gen_version generates a version 2 tuple
- change on_enable to a callable path in the imported plugin module

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- change out Version mechanism for a local parse method based off of LooseVersion
- update tests to proper unit tests

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- change from parse_version from setuptools to LooseVersion in distutils

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- Ensure plugin configuration json file is closed svisser