Hmf

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**Enhancments**

- Better get_hmf function

**Bugfixes**

- Fixed "transfer" property
- Updates fixed for transfer_fit
- Updates fixed for nu
- Fixed cache bug where unexecuted branches caused some properties to be misinterpreted
- Fixed bug in CAMB transfer options, where defaults would overwrite user-given values (introduced in 1.6.0)
- Fixed dependence on transfer_options
- Fixed typo in Tinker10 fit at z = 0

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**Features**

- New Tinker10 fit (Tinker renamed Tinker08, but Tinker still available)

**Enhancments**

- Completely re-worked caching module to be easier to code and faster.
- Better Cosmology class -- more input combinations available.

**Bugfixes**

- Fixed all tests.


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**Features**

- Introduced _cache module: Extracts all caching logic to a
separate module which defines decorators -- much simpler coding!

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**Features**

- Added get_hmf function to tools.py -- easy iteration over models!
- Added hmf script which provides cmd-line access to most functionality.

**Enhancments**

- Added Behroozi alias to fits
- Changed kmax and k_per_logint back to have ``transfer__`` prefix.

**Bugfixes**

- Fixed a bug on updating delta_c
- Changed default kmax and k_per_logint values a little higher for accuracy.


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**Features**

- Added ability to change the default cosmology parameters

**Enhancments**

- Made updating Cosmology simpler.

**Bugfixes**

- Fixed a bug in the Tinker function (log was meant to be log10):
- thanks to Sebastian Bocquet for pointing this out!
- Fixed a bug in updating n and sigma_8 on their own (introduced in 1.4.0)
- Fixed a bug when using a file for the transfer function.

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**Bugfixes**

- Changed license in setup

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