echo the source code
install scala for example 106
unfortunately Ubuntu does not ship Scala 0.10 yet, so string interpolation in Scala won't work; let is use dumb examples instead

the randomness in examples also brings noise to testing
make 106
cache the setup chunk so the path of scala is always there on my own machine even if I have removed it
just moved tikzDevice to rforge.net/tikzDevice so that we can get daily build
ignore the possible differences in examples 009, 010, and 021; closes #19
the dependencies of tikzDevice should be installed from CRAN
seems I should use $$ here