Combinatoric Cheatsheet

A combinatoric cheatsheet. It include methods names and a short
description.
Merge branch 'master' of https://github.com/Mba7eth/sympy into comb_cheat
Updated Makefile for combinatoric cheatsheet.
Modified func_coef
Added first method for linear system 2nd order 2eqs
Added first method for linear system 2nd order 2eqs
Added method to solve type2 of 2nd order
Resolved conflict
Modification in test cases and is_linear match
Added some methods for linear system of 2 eqs for 2nd order
Modified func_coef
Added first method for linear system 2nd order 2eqs
Added method to solve type2 of 2nd order
Modification in test cases and is_linear match
Added some methods for linear system of 2 eqs for 2nd order
resolved conflicts
Added all methods of linear system of 2 eq of 2nd order
Added all methods of linear system of 2 eq of 2nd order
Merge branch 'sysode_linear_2order_2eq' of github.com:KDMOE/sympy into sysode_linear_2order_2eq
Removed .bashrc file