Revert GitHub organisation name to AtChem. (#252)

Revert GitHub organisation name to AtChem.

Makefile

@@ -25,11 +25,11 @@ ifeq ($(TRAVIS),true)
 ifeq ($(TRAVIS_OS_NAME),linux)
 # if linux, pass gfortran and apt-get install location for cvode
 FORT_COMP    = gfortran
-CVODELIB     = /home/travis/build/AtChem2/AtChem2/cvode/lib
+CVODELIB     = /home/travis/build/AtChem/AtChem2/cvode/lib
 else
 # if macOS, then pass homebrew gfortran and self-built cvode
 FORT_COMP    = /usr/local/Cellar/[email protected]/4.8.5/bin/gfortran-4.8
-CVODELIB     = /Users/travis/build/AtChem2/AtChem2/cvode/lib
+CVODELIB     = /Users/travis/build/AtChem/AtChem2/cvode/lib
 endif
 # else it's not on Travis, so check the OS, and then pass local path to cvode
 else

README

@@ -6,13 +6,13 @@ This directory contains sources of the AtChem2 application. The tools directory
 
 AtChem2 requires a working Fortran compiler, BLAS and LAPACK libraries, CVODE library, openlibm library, and a Python 2 installation. Running the testsuite additionally requires a numdiff installation.
 
-Please refer to https://github.com/AtChem2/AtChem2/wiki/1.1-Dependencies for installation instructions of these dependencies.
+Please refer to https://github.com/AtChem/AtChem2/wiki/1.1-Dependencies for installation instructions of these dependencies.
 
 **********************************
 * Building AtChem2
 **********************************
 
-Please refer to https://github.com/AtChem2/AtChem2/wiki/1.-Installation for installation instructions. Very briefly:
+Please refer to https://github.com/AtChem/AtChem2/wiki/1.-Installation for installation instructions. Very briefly:
 
 After having installed all dependencies, please note that at present AtChem2 requires recompilation for each new .fac file. This is all handled by the script "./tools/build.sh", which converts the .fac file into a format usable by AtChem2 (namely, it generates two Fortran files and several data files).