Makefile added to .gitignore, solving issue #39
Shapefile and cs.csv used in the tests added to the database folder.
Merge commit 'e61613bb029decad29d67d591a0fe4752e65c889'

* commit 'e61613bb029decad29d67d591a0fe4752e65c889':
  Small correction to remove a bug in the tests that do not use argument folder.
  Database tests added.
  Checks to pass the database tests.
  Small update to the importDatabase function.
  Adding one more data file.
  Updating error messages.
  Removing global variable.
  Updating error messages for loadNeighborhood.
  Small change on the final report.
  Small correction in an error message.
  Prints while loading and saving data were removed.
  Removing useless lines.
  Adding a prototype to import databases.
  Small change on an error message.
  More data files.