Merge pull request #79 from nkindlon/master

Enabled column retrieval by number for BAM files
correct intersect unit test - was pointing to test binary
tweaks for 2.20.0
Setting Release-Version v2.20.0
docs formatting
fix for slop bug in issue \#82
updates for 2.20.1
Merge pull request #83 from nkindlon/master

Fixed bug for files with no newlines.
update history for 2.20.1
Setting Release-Version v2.20.1
Merge pull request #86 from nkindlon/master

Added new -iobuf option and unit tests.
Update links in docs to point to the bedtools2 github pages.
Merge pull request #89 from mdshw5/master

Update links in docs to point to the bedtools2 github pages.
Fisher's Exact Test
Move "using namespace std" after #includes

...so that namespace "std" already exists when we try to use it,
as it will have been declared by the standard headers #included.
Doing otherwise elicits a warning from clang.
Miscellaneous portability / warning fixes

Remove extra parentheses that clang thinks are there to prevent a
different warning for "if (numConsumedByB = 0) /*assignment intended*/".
Use 0 instead of NULL to initialise non-pointers.
Only const *integral or enumeration* static data members can be portably
initialised within the class definition.
Check stderr is empty, not stdout (fixes test for #46)
Merge pull request #95 from jmarshall/warnings2

Various warning fixes redux
adjust Makefile to accomodate Intel compiler.
Merge branch 'master' of https://github.com/arq5x/bedtools2