A draft for pythran-replay tool.

How to use the tool?
* Copy the benchmark and the pythran-replay script in the
  pythran working space, and the run the script.
* BUG: the program seems not runnable all the time. There
  are still many work on it.
The interface of the program is changed.

* Instead of establishing benchenmark folders,
  this tool now take any file with pythran export as benchmark.

How to use this program?

- Copy the script pythran-replay into the pythran working space.
- ./pythran-reply <pythran_file> -s <setup> <statements>
 -n <run_counts>

* TODO: option [-r] from a commit to annother, with a certain steps
  between each two commits.
Basic interface established.

To use this program, now there are three ways to select commits.
- from a commit to another, with steps between commits.
- begin with a commit, take another after step commits. And in total n commits taken.
- run for a specific commit.
Add logging for the script.

* This commit only give a rough idea of logging,
  further cases will to be concerned.
Add results plot and accomplish the user interface.

results plot:
* plot the results with X axis as commit_time, Y axis as best_execute time.
* save plot locally in format .png, and the figure's name is the branch name,
  which are to be improved.

interface:
* The option -r is changed for the same as timmit.
Change from tic-toc to timeit and add show option for user.

* The tic-toc way is share the same setup statement, this
  save a little time, but may cause problem. However, with
  the timeit, we have much less things to concern.
* To show the plot figure after execution, add --show on the
  command line.
Add --repo_path option and remove normalize function.

* For adding this new option, the REPO has to be declared in the
  "__main__" as a global variable rather than put if ouside.
* The normalize function seems no longer interesting for plotting.
Simplify commits selections and varify input by re.

* the commits selection is now taken by the option --range
* the option --count_range is still keeped for convinience.
Add command line restriction and pythran error msg management.

* Verify if input benchmark file exists
* Verify if input commit(s) exist in the given branch
* Replace sys.system() by commands.getstatusoutput()
* Add option -q(--quiet) to avoid pythran msg output
Add timeit exceptions detection, change image saving name.
Accomplished reports building

Other changes:
* fix time zone bug
* adjust plot axis
Add basic info in the report & add compile plot in the figure
Add replot result program.
Add multiple time evaluations

* The change includes: results dict, report, plot
Many changes

* Add config parser
* simplify the code
* simplify log setting, remove the date and time part
remove float_sum_python.py
Add absolute position plotting
Fork a process for each timeit!

* Separate the environment for each timeit, this may use more
  system ressource but it has fixed the bug!
Delete useless curves on plotting

* worst, mean, median...
Fix bug of the default commits.

* If no commit selected, the script choose all the commits of the given branch
* If no branch selected, the script choose the master.