v0.14.2: Documenter (#640)

* Renamed doc/ to docs/.

* Updated gitignore with new docs directory (and docs/site).

* Added documenter builds to travis.

* Updated link in README and added latest badge.

* Started restructuring docs directory.

* Renamed all the .rst files to .md.

* Added JuliaStats logo.

* First pass converting the restructured text to markdown.

* Migrated function docs to docstrings for the appropriate types. NOTE: This often required making some default methods which fail if dispatched to.
* Added some missing references when possible.
* Added a few (mostly empty) docstrings on a few undocumented, but exported distributions.
* Fixed a few equation formatting issues (e.g., `FDist`).

* Minor fixes, but some of them are kind of hacks around the documentation system.

* Turned docstring methods into empty methods that won't be dispatched to.

This allows us to have custom docstrings that won't introduce new methods that could change the behaviour.
Reverted changes to testutils.jl

* Fixed bad references in some univariate docstrings.

* A few formatting fixes.

* Proper escaping of all the latex equations to support 0.7.

Looks like the Base.Markdown.MD `doc""" ... """` syntax doesn't play well with escaping latex equations.
The result is poorly formatted equations in documenter, but using normal docstrings works fine.

* Fix a few more missing escapes

* Convert `NoncentralChisq` to normal docstring so that Documenter can render the equations properly.

v0.14.1

Emergency fix to get distributions to work on 0.6 (#637)

v0.14.0: Allow AbstractVector in _rand! for ConjugatePriors.jl (#625)

* Allow AbstractVector in _rand! for ConjugatePriors.jl

* Remove ambiguity in _rand!

* Also sample a single variate in mvnormal.jl

v0.13.0

Added support for passing in a `AbstractRNG` to some of the univariat…

v0.12.5: Fix multivariate log likelihood refactor (#594)

Also bump PDMats requirement

v0.12.4

Fix handling of .+ and .- overload deprecation (#593)

v0.12.3: Fix kurtosis calculation for FDist (#591)

* Fix kurtosis calculation for FDist

* Test correction of FDist kurtosis

v0.12.2: Fix a couple deprecation warnings on 0.6 (#585)

* Fix deprecation warnings on 0.6

* Conditionally import scale from Base to avoid errors

* Overload .+ and .- on sufficiently old Julia

New type syntax

v0.12.1

Fix most depwarn/error on 0.6 (#577)

Getting ready for 0.6

Update to Julia 0.6 (#570)

* Fix Julia 0.6 deprecations

* Remove promote_eltype and convert_eltype definitions

* Adjust tolerance in multivariate mixture test

* Add QuadGK as dependency

* Delete tests that hook into internal type fields

* Make multivariate and matrix distributions work just with Base's promote mechanisms

* Don't fail if ambiguous methods are detected. Just show them.

* Drop Julia 0.4 support and bump PDMats version

* Use isapprox istead of ≈ to make tests pass on Julia 0.5

* Stop testing on Julia 0.4