add: support for setting TR in fsl.Merge
doc: improved for fsl.Merge and included example usage
tst: included tr in test dict for fsl.Merge
add: option 'a' for autochoose
fix: set tr position to -1
doc: updated to use funcfile and test cmdline output
rm: _list_outputs and _gen_filename from fsl.Merge
add: _format_arg override to support tr
fix: include name_source and name_template for mergefile in fsl.Merge input_spec
fix: indentation error
rf: modify fsl.Merge api to abstract setting TR when merging along time dimension
tst: added test_fslmerge with check for tr updates
fix: display cmdline string explicitly
doc: updated doctest to use literal string
fix: updated doctest, pep8 and unit test
Merge pull request #1 from satra/fix/doctest

fix: updated doctest, pep8 and unit test
Merge pull request #707 from nicholsn/enh/fslmerge-tr

Update FSL Merge to Support TR Parameter