Add support for LDAP failover

Add host failover support to this library. It's been supported in Net::LDAP for some time.

See merge request !4

Escape wildcards in username.

Addresses https://dev.gitlab.org/gitlab/gitlabhq/issues/2086.

Also see https://dev.gitlab.org/gitlab/gitlab-ee/merge_requests/344 and https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/1644.

See merge request !2

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Bump net ldap

Related to gitlab/gitlabhq#1700

See merge request !1

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Considering we are bumping net-ldap from 0.3.1 to 0.7.0 I thought a
minor version bump might be called for.

net-ldap version update

There is a bug in net-ldap < 0.5.0 preventing connections to Microsoft servers. Pushing the net-ldap dependency version should fix it. See the following net-ldap issue for a description.

https://github.com/ruby-ldap/ruby-net-ldap/issues/80

See merge request !2

https://github.com/ruby-ldap/ruby-net-ldap/issues/80

Sync with intridea/omniauth-ldap

Update version to match intridea/omniauth-ldap.
Add test for alternate fields.

Conflicts:
	README.md
	spec/omniauth/strategies/ldap_spec.rb

Minor documentation fix

Update net-ldap gem to avoid errors with some LDAP Servers

gitignore Gemfile.lock

add license information to the gemspec

Conflicts:
	spec/omniauth/strategies/ldap_spec.rb

Gemfile.lock: update net-ldap to fix LDAP authentication issues

Newer LDAP servers fail with older versions of net-ldap.
Update to the fixed version.

Signed-off-by: David Aguilar <davvid@gmail.com>

The Gemfile.lock shouldn't be included in a gem-based repository
because it may artificially lock obsolete gems.

An example of this is rb-fsevent which at the version it was
locked at is incompatable with OS X 10.8

If something does need the version locked, specify it in the
.gemspec or Gemfile itself.

This way it can be used with rubygems.org API

Reformatted specs and reworked way to propagate InvalidCredentials error to application