* Significant improvements to the high-level interface to the Materials API.
New interface provides more options to make it easier to get structures and
entries, better warnings and error handling. It uses the _requests_
library for a cleaner API.
* Bug fix for VolumetricData parsing and methods such as CHGCAR and LOCPOT.
Previously, the parsing was done incorrectly because VASP actually provides
data by running through the x-axis first, followed by y, then z.
* Bug fix for reverse_readline so that it works for gzipped and bzipped
structures (courtesy of Anubhav Jain).
* Fix "lossy" composition to_dict method. Now composition.to_dict properly
returns a correct species string as a key for compositions using species,
instead of just the element symbols.
* Miscellaneous bug fixes.