stab for R: 
data analysis of drug stability for shelf life estimation

Update log
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~ 12/11/2014 (0.1.9)
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   - added citation into output files;
   - fixed stab.setup() & go() to avoid crash;
   - added system info into output files;
   
~ 12/10/2013 (0.1.8)
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   - fixed output file as automatically selected from input file name;
     and will check it the output files exists or not; it will not
     overwrite the existing file and rename the output automatically
     with "xxx_01.txt" or "xxx_01.pdf" if necessary.
   - also added the exported raw dataset as .csv format; original was 
     .RData only.
   - fixed %CI of user's defined;
   - fixed .csv dataset loading problem with single batch study;
   - fixed some output formats;
   - fixed model #3 output plots.
   - fixed demo module (no pdf output; but display plots on screen);
   - added stab_setup() for stab setup file; like bear...

~ 11/29/2013 (0.1.7)
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   - set CI as option (default is 95%);
   - used data editor to set up parameters now as bear;
   - fixed pdf output incompletedly closed after running a project;
   - fixed abnormal crashed when no solution can be found;
   - fixed the repeated batch # for model #3.
   - fixed some typo...

~ 09/24/2013 (v0.1.6)
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   - added 'tests' subdir and test_run() for test;
   - corrected some typo with spelling check;
   - switch 'windows(record=TRUE)' to 'dev.new()' for linux/unix-like OS;

~ 04/11/2013 (v0.1.5)
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  - switched from solving a quadratic eq. for shelf-life
    to graphic method (95% CI);
  
  - thus we fixed inconsistent results between calculated
    shelf-life and the list of 95% CI for multiple batches;
  
  - outputs have been directed to a .txt and .pdf files;
    .txt is for statistical results, and .pdf is for
    graphic output.
    
  - the demo still keeps as it was; i.e., using the method
    of solving quadratic eq. for historical reasons.
   
  - add the examples from the textbook, as well as to 
    validate stab for R.
    
  - since stab v0.1.4 was just released on March 7, 2013,
    we have to wait for two more months before next release.
    however, this 'pre-release' has been finished and is ready
    to release. Once it has been submitted to CRAN and
    has been accepted by CRAN core team, this pre-release
    will be removed from here.
    
  - thanks for using stab for R.
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