Add OSX version of sed -- see #281, #293 and #332

pages/osx/sed.md

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+# sed
+
+> Run replacements based on regular expressions.
+
+- Replace the first occurrence of a string in a file, and print the result:
+
+`sed 's/{{find}}/{{replace}}/' {{filename}}`
+
+- Replace only on lines matching the line pattern:
+
+`sed '/{{line_pattern}}/s/{{find}}/{{replace}}/'`
+
+- Replace all occurrences of a string in a file, overwriting the file (i.e. in-place):
+
+`sed -i '' 's/{{find}}/{{replace}}/g' {{filename}}`
+
+- Replace all occurrences of an extended regular expression in a file:
+
+`sed -E 's/{{regex}}/{{replace}}/g' {{filename}}`
+
+- Apply multiple find-replace expressions to a file:
+
+`sed -e 's/{{find}}/{{replace}}/' -e 's/{{find}}/{{replace}}/' {{filename}}`