Remove javabuilder from spring-aspects .project

Previously, the build script was configured to add ajbuilder to the set
of Eclipse/STS build commands, meaning that both javabuilder and
ajbuilder would be present for spring-aspects. This causes unpredictable
behavior, as these two builders compete with each other. As ajbuilder is
a functional superset of javabuilder, this commit ensures that only the
former is present for spring-aspects' .project file.

Also removed warning language in import-into-eclipse.sh about
spring-aspects failing after adding Git support, as this intermittent
problem was almost certainly an artifact of the situation described
above.

build.gradle

@@ -445,7 +445,8 @@ project('spring-aspects') {
     }
     eclipse.project {
         natures += 'org.eclipse.ajdt.ui.ajnature'
-        buildCommand 'org.eclipse.ajdt.core.ajbuilder'
+        buildCommands = [new org.gradle.plugins.ide.eclipse.model.
+                BuildCommand('org.eclipse.ajdt.core.ajbuilder')]
     }
 }
 

import-into-eclipse.sh

@@ -116,9 +116,5 @@ STEP 5: Enable Git support for all projects
 
 When complete, you'll hvae have Git support enabled for all projects.
 
-Note: if any projects have errors after adding Git support
-(e.g. spring-aspects), simply go to Project > Clean... and clean that
-project. This should remove any errors.
-
 You're ready to code! Goodbye!
 EOM