Zernike and Bispectrum should be also added to importhelper

[Alireza Khorshidi]

Currently we have Gaussian here, but not Bispectrum and Zernike.

I guess those also should be added.

[Muammar El Khatib]

I have added them to the __init__.py file. I am also trying to fix a TypeError that is introduced by the polynomial cutoff as implemented in branch issue66.

Edit: The TyperError is only introduced in the Zernike descriptor.

[Muammar El Khatib]

• Zernike and Bispectrum were added to importhelper. This fixes #135.
• TyperError introduced by p.gamma is corrected here.

→ <<cset 4f73c5aab256>>

[andrew_peterson]

• Zernike and Bispectrum were added to importhelper. This fixes #135.
• TyperError introduced by p.gamma is corrected here.

→ <<cset 4f73c5aab256>>

[Muammar El Khatib]

Merge branch 'master' into symmetryfunctions

• master: (26 commits) Update install instructions. Fortran version number incremented. Clean up documentation before release. Change bad label. Update docstrings for property getter/setters. Cleaning a bit docs/releasenotes.rst and docs/tensorflow.rst. Fortran cutoffs cleaned up. Attempt to fix http://amp.readthedocs.io/en/latest/installation.html. Some improvements to documentation.
• Zernike and Bispectrum were added to importhelper. This fixes #135. - TyperError introduced by p.gamma is corrected here. Fix minimal typo in documentation.
• In this commit, zernike and gaussian descriptors play well with fortran and python cosine and polynomal cutoffs. - Bispectrum bispectrum.py is reverted to master version for the purposes of merging. Removed uneeded printing in cutoffs.py.
• Gaussian descriptor is working correctly both in python and fortran. - I cleaned the code a bit. Zernike is now using the fortran module correctly.
• It turns out that functions inside the contains block in modules have to return a variable with the same name as the function so that it is globally available for external programs. Some changes to bispectrum.py to help the merging.
• This commit fixes zernike dictionary problem. - I cleaned cutoffs.py. Easing merge from master with these changes. cutoffs.f90 is now a module. ...

→ <<cset afac4e3dca6a>>