Maintenance on dependencies and scripts.

[Announcement]

npm WARN deprecated uglifyjs@2.4.11: uglifyjs is deprecated - use uglify-js instead.
npm WARN engine request@2.79.0: wanted: {"node":">= 4"} (current: {"node":"0.12.18","npm":"2.15.11"})
npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN engine esprima@4.0.0: wanted: {"node":">=4"} (current: {"node":"0.12.18","npm":"2.15.11"})
npm WARN deprecated minimatch@0.3.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN engine hash-base@3.0.4: wanted: {"node":">=4"} (current: {"node":"0.12.18","npm":"2.15.11"})
npm WARN engine hash-base@3.0.4: wanted: {"node":">=4"} (current: {"node":"0.12.18","npm":"2.15.11"})
npm WARN engine hash-base@3.0.4: wanted: {"node":">=4"} (current: {"node":"0.12.18","npm":"2.15.11"})

these can easily be fixed in the build process, is there a particular reason the dependencies haven't been updated?

Additionally, why is make being use instead of npm scripts? it seems a bit odd and breaks compatibility for windows...

[Announcement]

https://github.com/Announcement/algebra.js/tree/maintenance is along the lines of this proposal

• unfortunately istanbul requires a bit of extra configuration that's what nyc is for

• rm -rf doesn't work on windows, so it's common practice to use rimraf for that but I won't do that unless we're in agreement.