added create job page

added create job page
changed timestamp for job model

changed timestamp exec_start_time for job model, as it was set as NOT
NULL, now it can be null when job created
changed max lenght of job name (title)

changed max lenght of job name (title) from 200 to 50
changed hardlinks to use django url
added helper for round up
changed min_value of reward from 0 to 1
removed admin app
changed Customer to Balance module use
implemented search for "my_jobs"