adding fs-extras for .remove(), adding Package#destroy() for cleaning up after errors
using rimraf instead of fs-extras
Merge branch 'master' into install-error-handling
outputting a warning instead of an error for download failures (especially for multiple remotes)
adding concurrency parameter to install command
if no js, do not create a js file
adding a test for js/css exclusion
simplifying gitignore for component.json files within test dir
Merge pull request #350 from treetopllc/install-improvements

component-install Improvements
component-install: remove --concurrency option

does not apply to the concurrency of _all_ concurrent downloads so it is a bit misleading anyway
re-compile readme template
styling
Merge pull request #349 from treetopllc/hasjs

component-build: JS Exclusion if no Scripts
Merge branch 'master' of github.com:component/component