add 10% performance test
add all() function to return all children
add _contains function to check whether a bbox completely contains another
fix remove all breaking insert, close #10
bump version
All bin dirs already on path for lifecycle scripts

NPM puts all node_module bin directories on the path before running lifecycle scripts.  So package bin files can be executed as if they are installed globally.
Add rtree to dev dependencies to let others run the perf script

Adding `rtree` to dev dependencies and adding `perf` to the npm scripts lets developers run performance benchmarks without having to install `rtree` globally.  Non-lifecycle scripts can be run with `npm run`.  E.g.

    npm run perf
Encourage override of toBBox, compareMinX, compareMinY for CSP issues

Where the Content Security Policy (or other) disallows the use of eval and related functions (e.g. browser extensions), the toBBox, compareMinX, and compareMinY methods can be overridden.
Merge pull request #14 from tschaub/less-evil-II

Encourage override of toBBox, compareMinX, compareMinY for CSP issues
Merge pull request #13 from tschaub/dev-setup

Basic instructions on running tests and performance benchmarks
switch to all fast path when it's known that all children match
Merge pull request #11 from twpayne/all

Experimental "all" codepath
better search code path for #11
fix search all, ref #11
update benchmarks, add changelog, bump to 1.3.0
simplify changelog
changelog fixes
stricter jshint options, add jshint to test script
add Travis CI
add jshint dep, fix build