Merge pull request #20 from pelias/docs

docs
fix lat error
Merge pull request #21 from pelias/fix_lat

fix lat error
work with precisions 1..9 based on the zoom levels
using precision levels 1..5 only
fixing valid query test
test precision (and while writing the test, caught/fixed the bug where zoom=4 ftw)
better naming
updating getPrecision() to handle null/undefined/empty zoom params
display all admin fields
Merge pull request #25 from pelias/display_all_admin_fields

display all admin fields
Merge branch 'master' of github.com:pelias/api into precision
Merge pull request #24 from pelias/precision

work with precisions 1..5 based on the zoom levels
adding 'aliases' - 'poi' & 'admin' for the layers param.
adding type
adding type only if clean.layers are not undefined
valid precision - tests grouped together
Merge pull request #30 from pelias/alias_layers

adding 'aliases' - 'poi' & 'admin' for the layers param.
Merge pull request #31 from pelias/search-layers

searching layers
expand/ reverse size