only depend on psutil if the user actually uses the eclipse workspace modification feature
improved the error message for the case in which the find_in_workspace does return only one path
added optional platform argument - mostly for development
started tools.py
- cleaned up
- converted to template files instead of strings stored in py files - makes it easier to adapt
- in the template no longer {0} or {1} are replaced but more meaningful:

  {name}
  {srcDir}
  {buildDir}
- introduced verbose option
- supported user provided template files in $HOME/.eclipify/templates and $HOME/.eclipify/templates/<PLATFORM>
- suppored specifiying different search path
moved colored to tools
some style corrections and wording
Merge pull request #9 from ethz-asl/feature/moreFlexibleTemplateHandling

Feature/more flexible template handling