Log Message:
Update to version 0.4.6.

Upstream changes:
v0.4.6
 * Fix multiple RPC error generation
 * Add support for cancel-commit and persist param
 * Add more examples

v0.4.5
 * Add Huawei device support
 * Add cli command support for hpcomware v7 devices
 * Add H3C support, Support H3C CLI,Action,Get_bulk,Save,Rollback,etc.
 * Add alcatel lucent support
 * Rewrite multiple error handling
 * Add coveralls support, with shield in README.md
 * Set severity level to higher when multiple
 * Simplify logging and multi-error reporting
 * Keep stacktrace of errors
 * Check for known hosts on hostkey_verify only
 * Add check for device sending back null error_text
 * Fix RPC.raise_mode
 * Specifying hostkey_verify=False should not load_known_hosts
 * Check the correct field on rpc-error element

v0.4.3
 * Nexus exec_command operation
 * Allow specifying multiple cmd elements in Cisco Nexus
 * Update rpc for nested rpc-errors
 * Prevent race condition in threading
 * Prevent hanging in session close

v0.4.2
 * Support for paramiko ProxyCommand via ~/.ssh/config parsing
 * Add Juniper-specific commit operations
 * Add Huawei devices support
 * Tests/Travis support
 * ioproc transport support for Juniper devices
 * Update Cisco CSR device handler
 * Many minor and major fixes