Add module filtering to install.sh/main

spec/getFilteredModules_spec.sh

@@ -0,0 +1,26 @@
+Describe 'getFilteredModules'
+  Include ./install.sh
+  It 'returns all modules if no module arg is given'
+    allModules=(module1 module2)
+    When call getFilteredModules
+    The output should eq 'module1 module2'
+    The status should be success
+  End
+
+  It 'returns only mentioned modules'
+    allModules=(module1 module2 module3)
+    module=(module3 module2)
+    When call getFilteredModules
+    The output should eq 'module2 module3'
+    The status should be success
+  End
+
+  It 'returns only not mentioned modules if inversed'
+    allModules=(module1 module2 module3)
+    module=(module3 module1)
+    inverse=true
+    When call getFilteredModules
+    The output should eq 'module2'
+    The status should be success
+  End
+End