renamed queue to Queue
a workaround for a method dispatch issue
use default theme for doc (for the purpose of migrating the docs to ReadTheDocs)
change doc link to the readthedoc address
disable tests on release
find_cliques function

Only minimally tested. Needs top-level comment crediting NetworkX, and
needs a @graph_requires line
Export find_cliques function
Minimal tests for find_cliques
find_cliques: test for algorithm requirements

 - @graph_requires vertex_list and adjacency_list
 - graph must be undirected

See
http://networkx.lanl.gov/reference/generated/networkx.algorithms.clique.find_cliques.html#networkx.algorithms.clique.find_cliques,
the documentation for the code on which this is based, which specifies
that it is unsuitable for directed graphs.
Document find_cliques
Rename `find_cliques` to `maximal_cliques`.

This is for two reasons:

 - Other functions such as `connected_components` are named for what
   they return rather than what they do.
 - The function returns maximal cliques rather than all cliques.
Add docstring to maximal_cliques.

This credits the NetworkX find_cliques function, on which this code is
apparently
(https://github.com/pozorvlak/Graphs.jl/commit/4473d01bc3df181300ecf89f2e0169e46206e9d8)
based.
Document the random graph algorithms.

I've put them under Algorithms, even though all other graph constructors
were under Graph Types. I'm not sure if this is correct.
Merge pull request #62 from pozorvlak/maximal_cliques

Maximal cliques function.
Remove type signatures from random graph docs.
Merge pull request #63 from pozorvlak/doc_random

Document the random graph algorithms.
Make DFS tests pass on 32-bit machines.

simple_inclist uses Ints for vertices; on 32-bit machines, Int == Int32.
But test/dfs.jl hard-coded the use of Int64s for test data, which caused
type errors.
Merge pull request #66 from pozorvlak/32bit_dfs_test

Make DFS tests pass on 32-bit machines.
fixed multivecs call in simple_adjlist construction for adjacency matrix
Merge pull request #72 from uriahjb/master

fixed multivecs call in simple_adjlist construction for adjacency matrix