Replace MavenProjectResult with more appropriate Information

[khmarbaise]

Is your feature request related to a problem? Please describe.
The current content of MavenProjectResult can be used in a beforeEach() (#177) method. But this in consequence means that the naming of MavenProjectResult is misleading. Apart from that there are some areas of the directory structures are missing:

      src/test/java/../
         +--- FirstIT.java
                +--- test_case_one
      src/test/resources-its/.../
         +--- FirstIT/
                 +--- test_case_one
                         +--- src/...
                         +--- pom.xml

Currently we have the following:

   target/maven-it/
      .../FirstIT
           +--- test_case_one            <-- targetBaseDirectory
                   +--- .m2/             <-- targetCacheDirectory
                   +--- project          <-- targetProjectDirectory
                           +--- src/
                           +--- pom.xml  <-- model
                   +--- mvn-stdout.log
                   +--- mvn-stderr.log

Describe the solution you'd like
We have to change the naming as well adding supplemental information from the source area as well:

target/maven-it/
  .../FirstIT
       +--- test_case_one            <-- targetBaseDirectory
               +--- .m2/             <-- targetCacheDirectory
               +--- project          <-- targetProjectDirectory
                       +--- src/
                       +--- pom.xml  <-- model (targetModel)
               +--- mvn-stdout.log
               +--- mvn-stderr.log

And for the source area:

src/test/java/../
   +--- FirstIT.java
          +--- test_case_one      <--- sourceBaseDirectory
src/test/resources-its/.../
   +--- FirstIT/
           +--- .predefined-repo  <--- sourceRepo (optional)
           +--- test_case_one     <--- sourceProjectDirectory
                   +--- src/...
                   +--- pom.xml    <--- sourceModel

Define two new classes which contain the appropriate information:

• MavenTarget
  • baseDirectory, cacheDirectory, projectDirectory
• MavenSource
  • baseDirectory, projectDirectory, repository (optional)

Furthermore we need to separate out the information about the model pom.xml and should not combine that with directory information.

• MavenModelTarget
  • model (targetModel)
• MavenModelSource
  • model (sourceModel)