fix command line build instructions

the 'android project --path .' command is syntactically incorrect.

it also doesn't include the '--target' argument (which may only be
needed if one doesn't have the author's preffered sdk version (target)
installed.)

also added instuctions for listing names of targets, and how to get
more.
make github markdown -> html script happy

github needs newlines after plain text to treat the following indented
text as code.
Merge pull request #1 from sudoman/master

fix command line build instructions