Extra files
Merge remote-tracking branch 'upstream/master'
get-column-id now returns keyword version of column-key if convenient

If given column key is a string which is not used in a dataset,
and a keyword version of this column-key is used in the dataset -
return keyword version.
ifs replaced by cond.
Columns are explicitely casted to str in read-dataset.
Merge pull request #238 from Gerrrr/feature/sel_string

get-column-id returns keyword version of column-key if convenient
Merge pull request #241 from Gerrrr/bug/read_dataset_number_columns

read-dataset bug with numbers in header fixed
Update Travis CI link
Merge pull request #243 from farrellm/patch-1

Update Travis CI link
Merge remote-tracking branch 'upstream/master'
Updated links to incanter repository
Merge pull request #244 from mishadoff/update-links

Updated links to incanter repository
script will execute the command for top-level dir as well
provide more options in the project.clj
Merge branch 'master' of github.com:incanter/incanter
add the aggregate function

This closes #223
rewrite the repl script

also introduce the new namespaces for standalone REPL (in uberjar), and
namespace for execution from 'lein repl'.

Moved swingrepl to uberjar dependencies, using the reply instead of
jline (also only for uberjar).

This fixes #215
fix the tests
implemented gamma-coefficient and cleaned up documentation for pairings function
added tests for gamma_coefficient
added tests for gamma_coefficient