pushd: added platform specific examples in windows, osx and linux. Removed from common.

pages/osx/pushd.md

@@ -0,0 +1,15 @@
+# pushd
+
+> Place a directory on a stack so it can be accessed later.
+
+- Switch to directory and push it on the stack:
+
+`pushd < {{directory}}`
+
+- Switch first and second directories on the stack:
+
+`pushd`
+
+- Rotate stack by making the 5th element the top of the stack:
+
+`pushd +4`

pages/windows/pushd.md

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+# pushd
+
+> Place a directory on a stack so it can be accessed later.
+
+- Switch to directory and push it on the stack:
+
+`pushd {{directory}}`