Rename mapped_parameters -> metadata, original_parameters -> original_metadata
Automatic style corrections courtesy of autopep8.
Add  and  properties and deprecation warnings
Automatic style corrections courtesy of autopep8.
Change hdf5 file format to 1.2 and add a get_hspy_version function. Also correct typo in Hyperspy format name.
Make hdf5 read file format < 1.2
Automatic style corrections courtesy of autopep8.
Add warning for when trying to load an hdf5 file written using a newer HyperSpy version.
Rename mapped_parameters_structure.rst -> metadata_structure
Rename mapped_parameters and original_parameters in the docs.
Add hdf5 tests.
Automatic style corrections courtesy of autopep8.
Revert file format back to 1.1 not to break compatibility with HyperSpy 0.6.
Remove obsolate pip-req.txt.
Add article which used Hyperspy

A colleague of mine used PCA in Hyperspy for denoising in a paper
Merge pull request #186 from magnunor/add_article_using_hyperspy

Add article which used Hyperspy
Merge pull request #185 from francisco-dlp/Remove_pip_req

Remove obsolate pip-req.txt.
Merge pull request #184 from francisco-dlp/RENAME_mapped_parameters

Rename mapped parameters Closes #164
Merge branch 'master' into split_as_stack

Conflicts:
	hyperspy/signal.py
	hyperspy/tests/signal/test_tools.py