Merge pull request #5 from hron84/fix-gemspec

Adding rack-test gem to development requirements
Adding more parameters to services

Monit's xml contains more parameters than we already support, it would
be nice if we can support more info about system and services.

New parameters:

 * System:
   * os: Operating system
   * osversion: Operating system version
   * arch: Machine architecture
   * cputotal: Total nr. of CPUs
   * memtotal: Total size of memory (in KB)
   * swaptotal: Total size of swap area (in KB, nil if not supported)
 * Filesystem:
   * inode_percent, inode_usage, inode_total: Same values as block, but
     for inodes
 * Process:
   * total_memory: Memory usage of process and all children proces
   * total_cpu: CPU usage of process and all children process
   * response_time: monit supports checking a service within a process
     checking, and adds response time if it's available (or nil if not)

I added tests for these values too, and fixed formatting of source where
it is needed. All tests are passing
Adding configuration to Travis CI
Adding forward Travis badge
Adding rake to Gemfile
Adding minitest
Fixing typo
Adding children
Merge branch 'develop' of git://github.com/hron84/monittr into develop