title: Cannot change project facet java version to 1.7 (Option not available)
body: <p>So I have a project where the Java Compiler being used is 1.7. But in the project facet the Java version is 1.6. So I get the following error:</p>
  
  <p><img src="https://i.stack.imgur.com/Z1i5p.png" alt="enter image description here"></p>
  
  <p>So I have 2 choices, I can either change my compiler version down to 1.6 or I can change my project facet version up to 1.7. I don't want to do the former though, when I change my compiler level down to 1.6 then I can't use diamond operators and, well I want all those java 7 features! So, I need to change my facet version up to 1.7. But alas, when I try and do it, 1.7 isn't even available:</p>
  
  <p><img src="https://i.stack.imgur.com/f6DnX.png" alt="enter image description here"></p>
  
  <p>So I ask you... why? :\</p>