Update project services to include all supported ones

doc/project_services/project_services.md

 # Project Services
- 
-__Project integrations with external services for continuous integration and more.__
+
+Project services allow you to integrate GitLab with other applications. Below
+is list of the currently supported ones. Click on the service links to see
+further configuration instructions and details. Contributions are welcome.
 
 ## Services
 
-- Assembla
-- [Atlassian Bamboo CI](bamboo.md) An Atlassian product for continuous integration.
-- Build box
-- Campfire
-- Emails on push
-- Flowdock
-- Gemnasium
-- GitLab CI
-- [HipChat](hipchat.md) An Atlassian product for private group chat and instant messaging.
-- [Irker](irker.md) An IRC gateway to receive messages on repository updates.
-- Pivotal Tracker
-- Pushover
-- Slack
-- TeamCity
+| Service |	Description |
+| ------- | ----------- |
+| Asana     |	Asana - Teamwork without email |
+| Assembla 	| Project Management Software (Source Commits Endpoint) |
+| [Atlassian Bamboo CI](bamboo.md) | A continuous integration and build server |
+| Buildkite | Continuous integration and deployments |
+| Builds emails |	Email the builds status to a list of recipients |
+| Campfire | Simple web-based real-time group chat |
+| Custom Issue Tracker | Custom issue tracker |
+| Drone CI | Continuous Integration platform built on Docker, written in Go |
+| Emails on push | Email the commits and diff of each push to a list of recipients |
+| External Wiki | Replaces the link to the internal wiki with a link to an external wiki |
+| Flowdock | Flowdock is a collaboration web app for technical teams |
+| Gemnasium | Gemnasium monitors your project dependencies and alerts you about updates and security vulnerabilities |
+| [HipChat](hipchat.md) | Private group chat and IM |
+| [Irker (IRC gateway)](irker.md) | Send IRC messages, on update, to a list of recipients through an Irker gateway |
+| JIRA | Jira issue tracker |
+| JetBrains TeamCity CI | A continuous integration and build server |
+| PivotalTracker | Project Management Software (Source Commits Endpoint) |
+| Pushover | Pushover makes it easy to get real-time notifications on your Android device, iPhone, iPad, and Desktop |
+| Redmine | Redmine issue tracker |
+| Slack | A team communication tool for the 21st century |