Change the wordings of the path parameter when adding executable

When adding an executable, the path parameter has a caption "Please enter the path to your executable" which will literally mean adding the absolute path to the executable itself. For some executables such as the Maven this will lead to some subtle errors as Bamboo will assume the path location as the home and append an /bin/mvn. Here is an example:

Added path: /usr/local/apache-maven/apache-maven-3.0.4 /bin/mvn

Bamboo will translate to the following at build time:

/usr/local/apache-maven/apache-maven-3.0.4 /bin/mvn/bin/mvn