Extend snarkjs testing

This PR adds a test invoking all of the commands in `snarkjs --help`.

The new files in `snark_js/circom_files` were generated by Circom v2.1.5 (not
the latest release, but close enough).  I have considered the possibility that
Circom & Snarkjs undergo an update, introducing errors in the test script from
our outdated serializations in `circom_files/`.  Informally, I'd estimate the
likelihood is low.  I've never encountered or heard about snarkjs breaking
changes.  There are enough Circom circuits in production use cases out there, I
suspect they develop around backwards compatibility

Since the test script generates so many intermediate files - I created
`/tmp/snarkjs` at the beginning of the script and remove it at the end.  There
are plenty of subdirectories added to this folder, but I never bother to delete
them.  I let the recursive flag handle all that at the end.  Just pointing this
out in case there is a reason not to do that (if `test.sh` ends early, many
intermediate files are left).

Merges #6

images/snarkjs/circom-files/circuit.circom

@@ -0,0 +1,18 @@
+pragma circom 2.0.0;
+
+template Multiplier(n) {
+    signal input a;
+    signal input b;
+    signal output c;
+
+    signal int[n];
+
+    int[0] <== a*a + b;
+    for (var i=1; i<n; i++) {
+    int[i] <== int[i-1]*int[i-1] + b;
+    }
+
+    c <== int[n-1];
+}
+
+component main = Multiplier(300);

images/snarkjs/circom-files/circuit.sym

@@ -0,0 +1,303 @@
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images/snarkjs/circom-files/input.json

@@ -0,0 +1 @@
+{"a": 3, "b": 11}