Show examples of all default log levels.
fixed some outdated grammer
fixed more old grammer
[doc] Add `Installation` section to the README

Fixes #314.
fix profile(..) profile(.., {..}) metadata

Logger.prototype.log was called with (message, {..}, null) thus when
calling args.pop() you get "null" as meta.

We must pop() arguments untill they are not null.

Added test.

I had to refactor the logger tests because they were not called
synchronously.

As they are using the same logger instance, as they are using the
logger.once('logging') event, we must run them synchronously.

To run synchronous things in vows, well it's hacky, you must use sub-
contexts.
fix tests for profile fix

Vows, omg
Fix webhook tests when using node 0.10
Updated README to include all query options for reference
new *Transport({level: <level value>}): <level value> can be null to inherit level from containing Logger
Fixed HTTP Transport inheritance

Added call to transport constructor to correctly set up default values.
Merge pull request #332 from chbrown/master

new *Transport({level: <level value>}): <level value> can be null to inh...
Merge pull request #336 from killroy42/fix-http-transport

Fixed HTTP Transport inheritance
Merge pull request #325 from nanek/fix-node-10-tests

Fix webhook tests when using node 0.10
Merge pull request #330 from NitroPye/master

Updated README to include all query options for reference
Merge pull request #319 from vvo/fix-profile-metadata

fix .profile(..) .profile(.., {metadata}). Passing some metadata to profile.
[fix] stop testing 0.6 and start testing 0.10 on travis
Fix link to npm log levels
Merge pull request #350 from erwinw/patch-1

Fix link to npm log levels
Fixed one test failure on 0.10
Fixed one test failure on 0.10