CS
Merge pull request #8 from bulias/master

Ax=b
Merge branch 'spr'
Function 1 / (x*x - 1)
New function plus tests plus dividebyzero test
F(x) = (1+x)/(1-x)
testOneDivX
Merge pull request #13 from Rafiki5/rafaliwko

testOneDivX
F(x)=F(x) = (x * x + 1) / x -1
Merge branch 'master' into function

Conflicts:
	Tests/SimpleCalcTest.php
Merge pull request #11 from gajdaw2/function

F(x) = (1+x)/(1-x)
twenty eight div
twenty eight div
f($x) = ($x * $x + 1) / ($x - 1)
Merge pull request #17 from wmruk/wojtek

Function f(x) = (28+x)/(1-x)
New F(x)
Merge pull request #19 from mrugala88/exctest

Exctest
F(x) = (1+x)/(1-x)
New function plus tests plus dividebyzero test
F(x) = (1+x)/(1-x)