Minor fixes

Merge pull request #51 from whitewhim2718/fix-typos

Some small spelling/grammar fixes in "How HDBSCAN Works notebook

Cluster strengths

Support for cluster strengths and general bug fixes.

Plotting refresh

A visual refresh of the plotting routines, along with a series of bug fixes for various corner cases.

Working on Linux Again

0.7.2

Roll back _hdbscan_linkage to match 0.6.4 and remove some dead code.

Bugfix labelling

A very minor performance regression to get this fixed, but it eliminates segfaults on Linux, so is necessary.

Fixing Boruvka Issues and Dimensional Scaling

Boruvka scales poorly with dimension; by approximating the minimal spanning tree we can achieve far better scaling with dimension at the cost of slightly less accurate clustering. In testing the loss of accuracy seems very small, so I'm pushing it out with that defaulted to on.

Bug fix release

Fix bugs introduced when working around numpy performance regression.

Honda build requirements

Setting upper condo building

Bugfixes

Fix issues with 32 bit Windows installs
Fix issues caused by a performance regression in bumpy structured array accesses

More performance

Better performance
Fixes for Robust Single Linkage
Faster cluster extraction from trees
New Notebooks