1) Download and install Eclipse IDE for Java EE Developers 3.7 (Indigo), e.g., from here
2) Add Subversive SVN plug-in

• Help > Install New Software...
• Select Work with: Indigo - http://download.eclipse.org/releases/indigo
• Select Collaboration > Subversive SVN modules

• Restart Eclipse after the install

3) Install Google Plugin for Eclipse

• Help > Install New Software...
• Click Add, Name: Google Plugin for Eclipse, Location: http://dl.google.com/eclipse/plugin/3.7, OK
• Select Google Plugin for Eclipse (required) and SDKs > Google Web Toolkit
  

• Click Next, Next, accept license terms and Finish
• If there is a warning about installing software that contains unsigned content, click OK
• Restart Eclipse after the install

Install Web Tools Platform SDK

• Help > Install New Software...
• Select The Eclipse Web Tools Platform (WTP) software repository
• Select latest Web Tools Platform SDK

• Click Next, Next, accept license terms and Finish
• Restart Eclipse after the install
• File > New > Other...
• Select Server > Server, click Next
• Select Apache > Tomcat v7.0 Server, click Next
• Browse Tomcat installation directory, click Finish

• Alternatively, you can use Sysdeo Tomcat Eclipse Launcher
  

Create UniTime project

• See this UniTime SVN tutorial