Cleaned up get/post and added tests

"get" method is now even more low-level.
Bump version, added leei as a contributor
Fixing a global leak.
Updated update test for solr 3.5 error message
Moved test to package.json

No need for Makefile
Added sreeix as contributor
Version 0.1.6
Fix test instructions in README
Converted helpers to named functions
Pass options to createClient in test/common.js
Added test for basic auth
Allow passing in of options to affect requests

Also a general refactor. Refs #12
Version 0.2.0
Adding test and exports to lib to allow for inheritance of the solr.Client
Actually adding test this time
Version 0.2.1
Added unscene as contributor
More correct callback-nested example in README

Closes #16
Solr 4.x wants content-type to be set
Merge pull request #17 from fygrave/master

make node-solr compatible with solr 4.x