OpenQuake Hazardlib 0.22.0

[Marco Pagani (@mmpagani), Meya Yanger Walling]

• Implements the Megawati et al. (2003) GMPE for Singapore
• Fixed the sourcewriter in the case of NRML 0.5 sources with weights

[Michele Simionato (@micheles)]

• Improved the error message for XML files which are not NRML
• Added a test making sure that every GSIM is listed in the API documentation
• Added a logscale(x_min, x_max, n) function in valid.py
• Updated the documentation of the API
• Moved the NRML-related functionality from the engine into hazardlib
  in order to have an engine-independent Hazard Modeler Toolkit

[Daniele Viganò (@daniviga)]

• Add dependencies to setup.py
• Update Copyright to 2017

[Michele Simionato (@micheles)]

• Moved node.py from the engine inside baselib; stored the surface nodes
  inside the Surface classes
• Added more functions to compute mean and quantiles
• Cached the correlation matrix for speed

[Marco Pagani (@mmpagani), Michele Simionato (@micheles)]

• Extended the hazard curve calculator to manage mutually exclusive probabilities

[Michele Simionato (@micheles)]

• Made calc_hazard_curves parallelizable
• Moved the parallelization library of the engine into baselib
• Fixed a Python 3 issue in git_suffix
• Added support for AccumDict of accumulators
• Made the RtreeFilter pickleable
• Made the FilteredSiteCollections serializable to HDF5

[Daniele Viganò (@daniviga)]

• MANIFEST now includes all files, with any extension located in the
  tests folders. It is now possible to run tests from an installation
  made with packages

[Ozkan Kale, Graeme Weatherill (@g-weatherill)]

• Implements the Kale et al. (2015) GMPE for Turkey and Iran

[Michele Simionato (@micheles)]

• Fixed a 32 bit issue when the FilteredSiteCollection

[Marco Pagani (@mmpagani)]

• Add the azimuth 'distance' parameter

[Graeme Weatherill (@g-weatherill)]

• Modifies the Ry0 calculator for the planar rupture to avoid
  creating the Mesh

[Michele Simionato (@micheles)]

• Removed the rupture_site_filter from the calculators
• Removed the speedups and optimized the distance calculations at the
  numpy level