expanded build instructions to describe pyspark, and maven + node.js requirements
expanded build instructions to describe pyspark, and maven + node.js requirements

Author: Jeff Steinmetz <jeffrey.steinmetz@gmail.com>

Closes #405 from jeffsteinmetz/branch-0.5.5 and squashes the following commits:

d59230d [Jeff Steinmetz] use maven 3.3 link in setup example.  old links outdated
68cb04b [Jeff Steinmetz] maven install via apt-get clobbers the openjdk-7 install, and installs java6.  It also installs an older maven version.  Update ubuntu install example.
e457745 [Jeff Steinmetz] expanded build instructions to include pyspark, and clarified maven and node.js requirements
27e7930 [Jeff Steinmetz] expanded build instructions to include pyspark, and clarified maven and node.js requirements
1015f86 [Jeff Steinmetz] expanded build instructions to include pyspark, and clarified maven and node.js requirements
9617c01 [Jeff Steinmetz] expanded build instructions to include pyspark, and clarified maven and node.js requirements

elbamos/Zeppelin-With-R,elbamos/Zeppelin-With-R,elbamos/Zeppelin-With-R,elbamos/Zeppelin-With-R,elbamos/Zeppelin-With-R,elbamos/Zeppelin-With-R,elbamos/Zeppelin-With-R