Merge pull request #151 from carlu/master

Cheatsheets added for a couple of my favourite commands:

cheatsheets/indent

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+# format C/C++ source according to the style of Kernighan and Ritchie (K&R), no tabs, 3 spaces per indent, wrap lines at 120 characters.
+indent -i3 -kr -nut -l120

cheatsheets/rsync

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+# copy files from remote to local, maintaining file propertires and sym-links (-a), zipping for faster transfer (-z), verbose (-v).  
+rsync -avz host:file1 :file1 /dest/
+rsync -avz /source host:/dest
+
+# Copy files using checksum (-c), rather than time, to detect if the file has changed. (Useful for validating backups). 
+rsync -avc /source/ /dest/