add round_interval option
remove DEFAULT-value on TEXT-type column.
add term=range feature for fixed range period
Merge pull request #4 from issm/schema-fix

remove DEFAULT-value on TEXT-type column.
Merge pull request #2 from Songmu/feature/interval-option

Setting metrics interval seconds by `round_interval` configuration
Merge pull request #5 from Songmu/feature/range-term

add term=range feature for fixed range period
default datetime
Merge branch 'master' of github.com:kazeburo/HRForecast
ignore mymeta