documentation: fix request command for specific computer
console: ipython support
console: bpython support

both ipython and bpython are built and provided with slapos. bpython is the
default now, with colorful drop down menus. we can choose later.
Release 1.0.0rc2
Remove non-ASCII character for better compatibility.
configure client: fixed -h message
cli: group commands - client, node, other
node register: retain comments, reject non-ascii configuration templates
Merge branch 'cliff'
updated CHANGES
SlapObject: long methods cleanup

extracted methods download_binary_cache(), update_binary_cache(),
_pre_destroy()
SlapObject: removed useless try..finally blocks
SlapObject: cleaner buildout_cfg creation
SlapObject: cleaner handling of sr_symlink
SlapObject: removed method getSupervisorRPC
grid: logger usage % -> ,