Added Gemspec with new gems listing
Converted README to proper markdown. Easily readable now.
Added specs for Simple Random Sampling(SRS) and Time Series Analysis.
Removed depracated Shoulda includes from helper_tests
Modified param list in srs.rb for whitespaces.
Added tests for StratifiedSample with proper comments on their significance
Edited lib/statsample/multiset.rb for proper indentation, spacing and ruby patterns.
corrected doc typo
Regression tests
Repaired F tests, removed shoulda references
Prepared gemspec with updated version of dependencies for proper build and devs.
To build: gem build statsample.gemspec
To install: gem install ./statsample*.gem
Merged from clbustos. Merge remote-tracking branch 'upstream/master'

Conflicts:
	test/helpers_tests.rb
Wald test implemented
Implemented wald tests for acf mean, variance and distributed chi-square
Wald test. To test acf and fit on an ARIMA model.
Implementing pacf with yule walker for unbiased and mle method.
Implemented pacf with yule-walker.
Corrected a loop mistake in pacf implementation.
Completed and verified working on pacf - yule-walker unbiased and mle. :)
Next : tests
Additional comments on pacf usage documented
Initial tests for pacf
Tested assertions for pacf in range (1..10)
Notes on timeseries and test for Ankur