#174 Readme updates

[dangerdak]

Updates readme as per #174

• fixes issue where password wasnt in quotes
• explains how to build and seed the database
• provides template_directory environment variable
• changes password of seed user to 'password' for ease of use, and provides login details for this user in the readme

[codecov-io]

Codecov Report

Merging #212 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   78.65%   78.65%           
=======================================
  Files          26       26           
  Lines         431      431           
=======================================
  Hits          339      339           
  Misses         92       92

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