Input bypass capacitor Cin may be required for regulatorstability if the device is located more than a few inches fromthe power source.
Another one to look at is the MCP1700.
But for LDO regulators like the LD1117 and the LP2950 you have to be careful with the capacitor type. It cannot have too low an ESR (equivalent series resistance) nor too high an ESR else the regulator may oscillate. Generally tantalum or electrolytic capacitors are appropriate for LDO output caps, or a ceramic cap (very low ESR) with a 0.1 ohm resistor in series to ensure minimum ESR.
Multilayer Ceramic Capacitors are not normally used when you want a capacitor with low ESR, that's why they don't put it in the data sheet. You will find in in the sheets of polarised capacitors. By and large if it isn't in the data sheet they are not proud of it.
The RXJ010M2ABK-0511P is definitely overkill for this application (100V??) but its impedance is fine -- 0.16 ohms at room temperature (I'm not sure where you got the 7 ohms number from).
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