server: don't assume sid is numeric
test: fixed tests not passing with node-xmlhttprequest 1.5.0
socket: faster upgrades (we perform a check immediately)
Release 0.3.1
socket: improve check interval for upgrade
Release 0.3.2
transports: improved instrumentation
Slow upgrade should not take down server.

I noticed this on very heavily overloaded server - the typos raises an uncaught exception.
Merge pull request #93 from joewalnes/master

Slow upgrade should not take down server.
Release 0.3.3
socket: added missing jsdoc (gross)
package: `engine.io-client` moved to `devDependencies`
Release 0.3.4
package: reverted last commit - we use the parser from the client
Release 0.3.5
mass data test
remove console.log
Merge pull request #96 from c9/prio-flush

FAILING mass data test
socket: reset ping timeout on incoming data
Merge pull request #98 from indutny/feature-heartbeat-on-data

socket: reset ping timeout on incoming data