Add license into gemspec

So that tools like LicenseFinder can find licenses across gems easier
actually check to see if the class defines the execute/exec_query methods

defined?(<symbol>) doesn't seem to do anything.
Merge pull request #21 from github/fix-execute-check

actually check to see if the class defines the execute/exec_query methods
Merge pull request #20 from kuahyeow/patch-1

Add license into gemspec
Bump gem version in prep for 1.1.3 release
make rubyversion rbenv and rvm compatible

Also bump to latest 1.9.3
Remove Gemfile.lock file
Instrument sqlite3 instead of sqlite
Merge pull request #25 from arthurnn/ruby_version

make rubyversion rbenv and rvm compatible
Merge pull request #26 from arthurnn/remove_lock

Remove Gemfile.lock file
Merge pull request #27 from arthurnn/sqlite3

Instrument sqlite3 instead of sqlite
Testing against Ruby 2.0 and Rails 4.

Rails 4 is failing for a very strange reason right now, but
Ruby 2.0 works. :metal:

Conflicts:
	Gemfile.lock
Add rails 4.0.1 to travis
Add ruby-head for tests

Also test rails 4 on 1.9.3
Mysql query with a binary char was raising.

When mysql query contained a binary char we were getting:
 ArgumentError:invalid byte sequence in UTF-8
That is because we cannot do a regex match on the string.
In order to solve that we should use .include? string method instead of match.
Test in both mysql drivers
Merge pull request #28 from 37signals/fix_mysql_binary_char

Mysql query with a binary char was raising.
Match 'vendor/' instead of just 'vendor'
Merge pull request #29 from tnm/better-line-regex

Match 'vendor/' instead of just 'vendor'
Bump gem version to 1.1.4