Changes in version 0.1.5

* head and foot of the message are properly wrapped.
* qqcat: text are wrapped with fixed width per line by default

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Changes in version 0.1.4

* add `head` and `foot` arguments in `GetoptLong()` which set the head and foot
  of the help message
* change vignette format to Rmd

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Changes in version 0.1.3

* use `interactive()` to test whether under command-line mode
* update according to testthat 1.0.0

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Changes in version 0.1.2
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* update option functons with new version of GlobalOptions
* set `source()` as internal

Changes in version 0.1.1
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* add `source` which also allow specifying arguments in interactive session.

Changes in version 0.1.0
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* depends on `methods` package
* add `GetOptions` which is the same as `GetoptLong`

Changes in version 0.0.9
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* modified tests according to changes of `GlobalOptions` package

Changes in version 0.0.8
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* check atomic vector in `qq`
* If the interpolated variable is equal to NULL, it will be converted to "".

Changes in version 0.0.7
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* vignettes are rendered by knitr
* use `GlobalOptions` package to take care of the global settings
* default value can be set to NULL if it is optional
* if the option is designed as named list and has default value. Elements that are 
  not specified on command-line will be kept with their default values.

Changes in version 0.0.6
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* default value can be set as a list if the option is specified as opt=[sifo]%

Changes in version 0.0.5
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* use a global variable which is a flag of whether it is under command-line or not.
* If in interactive session and there is error, the session will be quite while
  throw error instead.


Changes in version 0.0.4
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* add `cat_prefix` argument in `qqcat` which is prior than `options('cat_prefix')`
  and not globally effective.

Changes in version 0.0.3
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* If command-line variable is a list, enforce the order of names of elements to 
  be alphabetical (in testing file, tag=%i).
  
* `help` and `version` will not be exported.

Changes in version 0.0.2
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* add `collapse` option in `qq` so that `qq` can return a vector instead of
  only collapsing them into one string.


Changes in version 0.0.1
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* the first release
